图9是我国第二次北极科学考察路线上温室气体的分析结果，读图完成下面试题。

1．从图中可以得到的正确信息是

    A．CO₂浓度随纬度升高而表现出逐渐减少的趋势

B．CH₄浓度在40°N以北随纬度增高而增加

C．人类活动是造成沿线CO₂和CH₄浓度变化的主要原因

D．洋流是造成沿线CO₂和CH₄浓度变化的主要原因

2．下列有关温室气体的正确说法是

A．温室气体就是指二氧化碳       B．温室气体能够反射红外线

C．CH₄是天然气水合物的主要成份  D．氟氯烃物质也是温室气体

虚拟水资源是指生产商品和服务所需要的水资源数量。读表完成：

3.从生态可持续发展的视角看，以色列农业的发展方向是

A．粮食种植业为主  B．乳畜业为主  C．园艺业为主  D．家禽饲养业为主

4.从虚拟水角度看，我国西北干旱地区应

①大量引进水密集型的产品  ②发展高效节水农业  ③调整农业结构

④优化饮食结构  ⑤充分开采地下水  ⑥大规模引进高山融雪水

A．①②③④  B．②⑤⑥  C．②③⑥  D．①②③⑤

. I wouldn’t want to go back ___   an employee now that I have been self-employed．

  A．to be     B．have been     C．be  D．to being

If you ______  the medicine, you____  better now.

A．took, would feel              B．had taken, felt

C．had taken, would feel             D．took, would have felt

--- Do you know the reason _________ pilots turn off the plane’s lights before taking off?

   ---The practice is for the passengers to adjust to the dark _________ an emergency.

A. why; for fear that                    B. for which; in case of          

C. how; for fear of                      D. that; in case

Whenever asked to help me with my lessons, he always refuses, ______ he is too busy.

A. to say           B. saying      C. says     D. having said

—Remember the first time we met, Jim? —Of course I do. You _____  in the library.

 A．were reading　　 B．had read    C．have read       D．read

We may be able to _______ you in some way if you can not finish your work on time.

 A. assist B. insist      C. provide D. evaluate

She is so ______ that no one can ever persuade her.

A. reliable         B. stubborn    C. artificial    D. intelligent

—Has the little boy passed_____P. E. test？

—He has tried twice and the teacher will allow him to have ______third try.

A. the； 不填  B. a； the  C. the； a  D. the； the