第二部分：英语知识运用（共两节，满分30分）
第一节：单项填空（15分）
21. People around are talking about the air heatedly recently, because it is the first time that they __________such hazy (雾霾) weather.
A. have met B. has met C. met D. had met
22. _____ injured were sent to_____ hospital immediately after the accident happened.
A. A; the B. The; a C. The; / D. An; /
23. As the river enters Southeast Asia, it travels slowly_______ low valleys _______ the plain where rice grows.
A. over, to B. through, to C. across, by D. through, by
24. ----Bob didn’t pass this exam.
----What a pity! He_______________.
A. should study hard B. study hard
C. should be studying hard D. should have studied hard
25. ________difficult the work may be, we must try to finish it on time.
A. What B. How C. Whatever D. However
26. This is the farm ________ he worked last summer holiday and ________ we visited last weekend.
