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2《时间》单元练习答案

五（下）第2单元《时间》单元测试（满分50分，时间15分钟）班级姓名成绩

一、填空（20分）

1、古埃及人最早把一天分（24）小时，其中夜晚（12）小时，白昼（12）小时

2、我国古代把一昼夜分为（12）个时辰，每个时辰相当于现在的（2）个小时。子夜是指（半夜、子时、夜间十一时至一时）

3、随着时间的变化，物体在阳光下的影子的（方向）和（长度）也会慢慢地发生变化。（太阳钟）就是利用这个原理制成的。

4、同一个摆每摆动一次所需的时间是（一样）的。

5、生活中的“摆”有（钟摆、秋千、风铃、吊灯、不倒翁、健身器中的踏板）

6、通过我们的反复实验发现，摆在每分钟来回摆动的次数与（长度）有关，与（摆重）、（摆幅）无关。

7、滴漏中水滴下来的速度和多少与出水孔的大小及（盛水容器水位）都有关。水能够稳定地滴漏下来就能做成水钟了，水钟有（泄水型）和（受水型）两种。8、利用光影计时的是（日晷）9、（摆钟）的出现大大提高了时钟的准确度。 10、人类使用最早的时间单位是（天）。

二、选择（16分）

1、有摆锤的钟每天都要走快几秒钟，为了使它走得准些，应该（每天拨动指针）

A、增大摆长

B、减少摆长

C、每天拨动指针

2、摆钟中摆的摆动快慢与（摆绳的长短）有关

A、摆锤的轻重

B、摆幅的大小

C、摆绳的长短

3、单摆在摆动时不发生改变的是（每次摆动所需的时间）

A、每次摆动所需的时间

B、摆幅大小

C、摆的方向

4、两个大小一样的滴漏，（水位高的）滴的速度快。

A、颜色深的

B、水位低的

C、水位高的

5、比较下图的两个摆的摆动速度，（1号摆快）

1号摆 2号摆

A、1号摆快

B、2号摆快

C、两个摆一样快

6、比较下图三个摆，在一分钟内摆动次数最多的是是（3号摆）

3号

1号 2号

A、1号摆

B、2号摆

C、3号摆甲乙

7、小麦在用单摆甲做实验，15秒摆动的次数为12次，如果小港用单摆乙做实验，则15秒摆动的次数应该是（12次）

A、多于12次

B、少于12次

C、12次

通过实验，我们知道了最后的结果。我们认为产生这种现象的原因是：摆重与摆的快慢无关

8、一个摆绳长度为15厘米的单摆15秒内摆动26次，如果希望单摆15秒内摆动15次，摆绳长度应该（比15厘米长）

A、15厘米长

B、比15厘米长

C、不到15厘米

三、简答&实验（14分）

1、两个彻底相同的秋千，一个大人（较重）和一个小孩（较轻）分别荡在两个秋千，在相同的时间内，谁荡的次数多？为什么？（3分）参考答案：在相同时间内，两人荡的次数一样多。（1分）因为秋千摆动的次数和摆重、摆幅无关，只和摆长有关。所以一个大人（较重）和一个小孩（较轻）分别荡在两个相同摆长的秋千，在相同时间内，两人荡的次数一样多。（2分）

2、画图：将细木条与重金属球组成如图A样式的摆，通过测量发现该摆每分钟摆动80次，要使该摆每分钟摆动的次数少于80次，金属球应安装在细木条的什么位置比较合适，请在图B中画出来。（1分）

你的理由是什么？（2分）

参考答案：我的理由是，因为要求是摆动的次数是少于80次，而摆的性质是：摆长越短，摆动次数

越多；摆长越长，摆动次数越少。所以图B的金属球应装在比图A金属球的位置更低处。

图A 图B

3、设计实验方案

研究的问题摆的快慢跟（摆长）有无关系。

实验前猜想猜想：摆的快慢跟（摆长）（有）关。（1分）

实验条件改变的条件：（摆长）不变的条件：（摆幅）（摆重）（3分）

对比实验过程（参考答案）①先把细绳固定在挂钩上，让摆能够自由摆动。然后在一定幅度下轻轻推动摆锤，用表测出摆来回摆动10次所需的时间。

②不改变摆锤的重量和摆动的幅度，把绳长增加到原来的两倍，同样测量摆10次所需的时间。

③将两组实验结果对比，得出结论。（3分）

实验结论摆的快慢跟（摆长）（有）关。（1分）

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Unit 7 Does money talk? Done with this task. Your current score: 100% Unit 7 test Next Directions: Click on the speaker to the left to start playing the audio recording for Parts I, II and III. They will be played continuously. Once the recording starts playing, please do NOT click on either the speaker icon or the 'Unit Quiz' link in the menu bar above. Otherwise, you may lose the chance of hearing the complete recording. Part I Script Directions: Listen to the short dialogs, and then choose the correct answers to the questions. You will hear the recording twice. After the first playing, there will be time for you to choose the correct answers. Use the second playing to check your answers. 1.(Listen to the audio recording for the question.) A. She is going to travel. B. She is going to blow it all immediately. C. She is going to save it for future use. D. She is going to invest it in a project. 2.(Listen to the audio recording for the question.) A. He plans to travel around the world to enjoy himself at his forties. B. He wants to lead a luxurious life. C. He thinks money can buy happiness. D. He hopes to save up money to help the poor. 3.(Listen to the audio recording for the question.) A. To spend it at Christmas. B. To pay the tuition.

第一单元练习答案 (2)

第一单元练习答案 word formation: compound nouns 1 Look at the sentences from the passage Looking for a job after university? First, get off the sofa. … proudly clutched his honours degree for his graduation photo. I don't want to do bar work. Paying for career consultations, train fares to interviews or books … It's a great antidote to graduate apathy. Notice that the first noun in each compound has the function of an adjective which describes the second noun. So apathy experienced by graduates can be expressed, as in the example, by the compound noun graduate apathy . Now write the compound nouns which mean: 1) a degree which is awarded a first class a first-class degree 2) work in a hospital hospital work 3) a ticket for a plane journey a plane ticket 4) a discount for students a student discount 5) a pass which allows you to travel on buses a bus pass 6) a room where an interview is held an interview room 7) a period spent in training a training period word formation: noun phrases 2 Look at the sentences from the passage Looking for a job after university? First, get off the sofa . … most in these financially testing times have no idea what to do next. Now write the noun phrases which mean: 1) a career which is rewarding from the financial point of view a financially rewarding career 2) legislation which has been introduced recently recently introduced legislation 3) instructions which are more complex than usual unusually complex instructions 4) an institution which is orientated towards academic an academically orientated institution 5) work which makes physical demands on you physically demanding work 6) information which has the potential to be important potentially important information 7) candidates who have been selected after a careful procedure carefully selected candidates 8) a coursebook in which everything has been planned beautifully a beautifully planned coursebook try as … might We use try as … might when we want to say that someone is making a great effort but still can’t

大二下新视野视听说单元测试答案

Part 1 Short dialogs and multiple choice questions (每小题：2 分) Directions: Listen to the following recording, and then choose the correct answers to the questions you hear. You will hear the recording twice. After the first playing, there will be time for you to choose the correct answers. Use the second playing to check your answers. 1. A. He has learned to make sounds like a cat. B. He found food for the woman's cat. C. He has become team captain. D. He has attracted the woman's attention. 2. A. The woman wants to play golf while the man wants to play tennis. B. The man wants to play golf while the woman wants to play tennis. C. Both the man and woman suggest playing golf. D. Both the man and woman suggest playing tennis. 3. A. Beautiful. B. Beautiful and intelligent. C. Intelligent and kind. D. Beautiful, intelligent and kind. 4. A. The man is positive and the woman is negative.