第二部分英语知识运用（共两节, 满分35分）
第一节 单项填空（共15小题；每小题1分，满分15分）
请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
16. Everybody has ______ responsibility to save water, if future generations are to enjoy _____ imilar standard of living to the one we enjoy now.s
A. the; / B. a; a C. /; the D. a; the
17. Scientists say human activity contributes to climate change, but they do not agree on the rate_______ climate change may be developing.
A. with which B. with that C. at which D. at that
18. Mary ______ all the housework, she dropped herself into the sofa, sighing with relief.
A. finished B. had finished C. having finished D. finishing
19. Each member country WTO must ___________ its laws and regulations and compete on the principle of fairness and cooperation.
