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快乐英语阅读和朗文分级阅读(1)

快乐英语阅读和朗文分级阅读(1)
快乐英语阅读和朗文分级阅读(1)

快乐英语阅读

判断题正确的写T ,错误的写F。

Uint5

1.Jerry likes eating. ()

2.He can't find his tooth. ()

3.The tooth is under the pillow. ()

4.His sister helps him find the tooth. ()

5.At last, he finds his tooth ( )

Unit6

1.The wife becomes the ruler of the sea at last.()

2.The fisherman is kind. ()

3.The fish can help the fisherman with everything.()

4.The wife would like to be a poor lady. ()

5.The fisherman's wife is as greedy as a wolf.()

Unit 7

1.The boy and the girl make a see-saw together. ( )

2.The boy and the girl weigh the car with stones. ( )

3.The car is the same as two bricks. ( )

4.The cat is the same as five bricks. ( )

5.The cat is naughty. ( ) Unit 8

1.Mr Wolf is short and has a big mouth. ()

2.One day, Mr Fox meets a hen. ()

3.Mr Wolf sends many pies and cakes to the hen.()

4.Mr Wolf likes eating and playing. ()

5.At last, the hen is very fast. ()

二.选择

Unit5

()1.One day Jerry can't find his___.

A.toy bear

B.tooth

()2.The tooth isn't under the ___.

A.pillow

B.sofa

()3.There's a football___the bed.

A.near

B.under

()4.The tooth___under the bear.

A.is

B.isn't

()5.Jerry likes___.

A.playing

B.eating

Unit6

()1.The fisherman's wife would like at first.

A.a new house

B. a new washtub

()2. Who lets the fish go?

A. The fisherman

B. The fisherman's wife

()3.A fisherman and his wife live in . A.an old house B. a new house

()4.The fisherman's wife would like to .

A. a poor lady

B. a rich lady

()5.The fisherman's wife is too .

A. greedy

B. kind

Unit 7

()1. The boy and the girl __________?

A.make a see-saw

B.fly kites

C.ride a bike

()2. How much does the car weigh?

A.The same as two bricks.

B.The same as five bricks.

C.The same as ten bricks.

()3.How much does the truck weigh?

A.The same as two bricks.

B.The same as five bricks.

C.The same as ten bricks.

()4. How much does the digger weigh?

A.The same as two bricks.

B.The same as five bricks.

C.The same as ten bricks.

()5.The cat is ________.

A.cute

B.naughty

C.beautiful

Unit8

()1. Mr Wolf is hungry because there is nothing to .

A. drink

B. eat

()2. The hen is too and too .

A. thin; small

B. fat; big

()3. At last, the hen is still , but her children are .

A. fat; thin

B. thin; fat

()4. Mr Wolf likes and .

A. cooking; eating

B. cooking; playing

()5. Mr Wolf has a big .

A. nose

B. mouth

()6. One day, Mr Wolf sees a .

A. hen

B. duck

朗文分级阅读

一.判断(T or F)

Unit 1

1. It's Saturday. There's no school day.()

2.The children are in the zoo.()

3.There is a fountain in the pond.()

4.The bee is dancing around the yellow sunflowers(黄色向日葵).()

5.The butterfly is foating around the pink daisies(粉红色雏菊).()Unit 2

1.Jimmy's new cap is cool.()

2.Jimmy can catch the ball!()

3.Candy is splashing Jimmy with water!()

4.Candy and Jimmy don't love the beach.()

5.Jimmy can make a long fish.()

Unit 3

1.Hoppy is at home now. ( )

2.The baby monkey has a long tail. ( )

3.The baby elephant is not Hoppy’s brother. ( )

4.Hoppy can see four babies in the room. ( )

5.Hoppy’s baby brother is a rabbit. ( )

Unit 4

1. Today is Bobby's first day of school. ( )

2. Bobby is very excited. ( )

3. Bobby can’t find his pencil,rubber,ruler,pencil box and school bag. ( )

4. Bobby’s pencil is on his desk. ( )

5. Bobby’s school bag is under his bed. ( )

二.选择

Unit 1

( )1.Today is___.

A.Sunday

B.Saturday

( )2.Tim is ___.

A.slow

B.fast

( )3.Tim and his friends are going to the___.

A.park

B.zoo

( )4.There is ___goldfish in the pond.

A.four

B.five

( )5.The fountain is___.

A.huge

B.small

Unit 2

()1.It's . It's hot.

A. summer

B.winter

()2.Jimmy has a .

A.stone

B.shell

()3.Candy has a hat.

A. big

B.small

()4.Jimmy's cap has a “J” on it.

A. yellow

B. red

()5. has a boat.

A. Candy

B.Jimmy u

Unit 3

( )1. Where is Hoppy?

A.in the park

B.in the zoo

C.in the hospital ()2. What animal is Hoppy’s baby brother?

A.a baby monkey

B.a baby elephant

C.a baby rabbit ( ) 3.How is Hoppy at last(最后)?

A.sad

B.happy

C.tired

( )4. What animal has a long neck?

A.rabbit

B.elephant

C.giraffe

( )5. Is the rabbit’s tail short or(还是)long?

A.short

B.long

Unit 4

()1.Tomorrow is the __day of school.

A. first

B.second

()2.__ helps Bobby find his things.

A.His mum

B.His dad

()3.In the dream, when bobby runs to school, he can’t find __.

A.his school bag

B.his clothes

()4. Bobby is looking for his __.

A.rubber

B. pen

()5. On that day, Bobby goes to bed __.

A.early

B. late

《分析化学》专业英语阅读材料03

《分析化学》阅读材料03 摘自Analytical Chemistry (FECS) ●In the Br?sted-Lowry theory, an acid is a proton donor and a base is a proton acceptor. Each acid is related to its conjugate base and vice versa: Acid = base + proton Therefore, the conjugate base of a strong acid must be a weak base and the conjugate base of a weak acid must be a strong base. Together they form a couple, and an acid without its conjugate base is a meaningless concept. In order to release a proton, the acid must find a base to accept it. In an aqueous solution, the proton, H+, having an extremely small ionic radius, cannot exist as such. It is hydrated, forming the hydronium ion H3O+ and higher hydrates. Thus, an acid-base equilibrium is not a simple dissociation equilibrium, but the result of a proton transfer reaction in which there are at least two reagents and two products. Such a process is also called protolysis. The overall reaction is expressed by: HX + H2O = H3O+ + X-. The overall equilibrium constant is K = [H3O+][X-]/[HX][H2O]. The acid dissociation constant Ka is given by: Ka = K[H2O] = [H3O+][X-]/[HX]. Ka reflects not only the acid strength of HX, but also the base strength of water. This why different acid dissociation constants are observed for the same acid in different solvent. ●Similar proton transfer reactions exist in all solvents possessing proton donor and acceptor properties. Proton transfer reactions are extremely fast. This makes them very suitable for analytical applications and acid-base reactions have found wide use in volumetric methods and other analytical techniques. ●The pH value is a measure for the acidity or basicity of a solution, aqueous or nonaqueous. ●Acid-base indicators are chemical substances with acid-base properties, having different colors in their protonated and deprotonated forms. ● A most important application of acid-base systems is related to the property of such a system to act as a buffer. Many chemical reactions produce protons (in aqueous solutions hydroniums) or hydroxide ions. If these products remain in the system, a corresponding pH change is observed. However, if a buffer is present in the solution it reacts with the liberated hydrogen or hydroxide ions so that only a relative small change of pH occurs. Buffer consist of a mixture of a weak acid and its conjugate base. The most efficient buffer for a given pH consists of a 1:1 ratio of the protonated and deprotonated forms of a weak acid (with pKa = pH). This cannot always be achieved, but if we wish to prepare a solution of a certain pH, we select a weak acid with a pKa value close to the desired pH. Buffer solution resists changes in pH upon adding of strong acids or strong bases. Depending on the relative concentrations of the acid and base forms of the buffer, the system can resist small or large additions of strong acid or base. This buffer capacity is defined as the number of moles of strong acid of base required to change the pH of 1 L of buffer solution by one pH unit. Solutions with high or low pH values, formed as a result of dissolution of large quantities of a strong base or acid, are characterized by a large buffer capacity, although the electrolyte practically consists of only one of the conjugate forms (e.g., HCl or NaOH solutions). ● A general requirement for all volumetric methods is that the titration process is fast and that it proceeds in a definite stoichiometric ratio, the endpoint of the reaction must by easy to detect and the reaction should be specific and not influenced by other constituents of the solution, i.e., there should be no interference. Question: 1. A H3PO4 solution is brought to pH = 7.00 by the addition of NaOH. Calculate the concentration of the various forms of orthophosphate if the total phosphate concentration in buffer is 0.200 mol /L. pKa1 = 2.16, pKa2 = 7.21, pKa3 = 12.32. 2. A buffer solution is prepared from acid, HA, Ka = 5 10-5, and its salt. The concentration of HA in the buffer is 0.25 mol / L. To 100 mL of the buffer added 5.0 mmol of NaOH, and the pH of the resulting solution is 5.60. What was the pH of the original buffer? 3.It is desired to change the pH of 100 mL of 0.100 mol / L HCl from 1.00 to 4.40 by the addition of sodium acetate, CH3COONa3H2O. How much solid sodium acetate salt must be added in grams? Assume no volume change for the solution as the result of the addition. 4.What is the buffer capacity of a solution which is 0.100 mol / L of NH3 and 0.200 of NH4Cl? 5.Calculate the pH of each of the following solution: (a) Water in equilibrium with CO2 of the air; pKa1 = 6.38, pKa2 = 10.25. (b) Water as in part (a) brought to pH = 7.00 with NaOH and allowed to regain equilibrium with CO2. 6. Derive the following expression for the pH at the first stoichiometric point in the titration of a mixture of two weak acid: HA, the stronger, Ka1, concentration C1; HB, the weaker, Ka2, concentration C2: pH = 1/2 (pKa1 + pKa2) – 1/2 lg (C1/C2)

《快乐英语阅读》五年级上册U1练习题

五上《快乐英语阅读》Unit 1练习题 选择 ()1.The crow is thirsty and _______. A.hungry B. tired C. happy ()2.The crow sees _____. A.some water in the jar B.some milk in the jar C.some coffee in the jar ()3.The crow drops _____ into the jar. A.some water B. some stones C. some pebbles ()4.The crow finds a house _______. A.in a park B.at the foot of the mountain C. in the hill ()5.The crow rests _______. A.in a tree B. on a chair C. in a bed ()6.The crow sees many pebbles ____ the house. A.in B.inside C. beside ()7.The glass jar is _____. A.tall and big B. small and soft C.short and hard ()8.Finally, the crow _________. A.gives up and flies away B.drinks the water happily C.dies of thirst ()9.What do you think of the crow? A.clever B. silly C. greedy ()10.What do you learn from the story? A.Never too old to learn. B.Where there is a will there is a way. C.A friend in need is a friend in deed. 判断 ()1.The story is happens in a summer day. ()2.The crow rests in a tree in a forest. ()3.The crow wants some bread to eat. ()4.There is a glass jar outside the house. ()5.There is a little water in the glass jar. ()6.There are some pebbles inside the house. ()7.At last, the crow doesn’t drink the water. ()8.The crow is thirsty and hungry. ()9.The glass jar is small, so the crow can drink water easily. ()10.The crow gives up after a long time of flying. 阅读短文,选出正确答案 It’s a hot summer. A thirsty crow rests in a tree in a desert. He wants to drink some water. After a long time flying, he finds a house at the foot of the mountain. The crow is excited to find a glass jar with a little water inside the house. However, he can’t reach the water because the jar is tall and big. There are many pebbles beside the house. He has an idea. He keeps collecting pebbles and dropping them into the jar. Finally, the water is close to the top of the jar. He drinks the water happily. ()1.Which season is it? A.spring B. summer C.winter ()2.What does the crow want ? A.some food B. some water C. some pebbles ()3.How can the crow drink the water finally? A.He drops some pebbles into the jar. B.He breaks the glass jar. C.He flies away. ()4.What do you learn from the story? A.Never too old to learn. B.Where there is a will there is a way. C.A friend in need is a friend in deed.

英语阅读材料

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计算机专业英语阅读材料

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小学英语阅读理解的常见题型设置及解题技巧(附阅读材料)

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