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- 51The number of air crashes that ________in developing countries ________increasing.
A.happens; is
B.happen; is
C.happens; are
D.happen; are
开始考试练习点击查看答案 - 52All the scientific evidence ________ that increasing use of chemicals in farming ________ damaging our health.
A.show; are
B.shows; are
C.show; is
D.shows; is
开始考试练习点击查看答案 - 53The number of people who ________ left the island ________ reached 10,000.
A.has, has
B.have, have
C.has, have
D.have, has
开始考试练习点击查看答案 - 54Seventy percent of the students _____ taken part in the work and seventy percent of the work _____been finished.
A.has, has
B.had , had
C.has, have
D.have, has
开始考试练习点击查看答案 - 55Two hours away from the tall buildings of New York ________.
A.some of the world's largest bears live
B.lives some of the world's largest bears
C.do some of the world's largest bears live
D.live some of the world's largest bears
开始考试练习点击查看答案 - 56________ of the land in that district _______ covered with trees and grass.
A.Two fifth; is
B.Two fifth; are
C.Two fifths ; is
D.Two fifths; are
开始考试练习点击查看答案 - 57Where to get the materials and how to get them ________ at the meeting.
A.have not discussed
B.have not been discussed
C.has not discussed
D.has not been discussed
开始考试练习点击查看答案 - 58A survey of the opinions of experts ________ that three hours of outdoor exercise a week ________ good for one's health.
A.show; are
B.shows; is
C.show; is
D.shows; are
开始考试练习点击查看答案 - 59Exercise One should be done in class as an example, while the rest ________ as homework.
A.is to be finished
B.are to finis
C.are to be finished
D.is to finish
开始考试练习点击查看答案 - 60A survey of the opinions of experts _______ that three hours of outdoor exercise a week ________ good for one'shealth.
A.show; are
B.shows; is
C.show;is
D.shows;are
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