华东中石油《科技英语》2015年春学期在线作业(三)100分答案

《科技英语》2015 年春学期在线作业（三）

一、单选题（共20 道试题，共100 分。）

1. Every country tries to maintain a(n) ______ balance of trade, which assures it of the means to buy necessary imports.

A. organic

B. favorite

C. compound

D. favorable

正确答案：D

2. A marine shale, once believed to be a black mud rich in organic compounds, is a common source rock to ______ oil.

A. block

B. discover

C. originate

D. prevent

正确答案：C

3. Americans eat______vegetables per person today as they did in

1910.

A. twice as much

B. as twice many

C. twice as many

D. as twice much

正确答案：C

4. I know Jonathan quite well and never doubt ______he can do a good job of it.

A. while

B. that

C. when

D. what

正确答案：B

5. If it_____tomorrow, we will stay indoors to have our training class.

A. rains

B. rained

C. will rain

D. is raining