B. Water pollution
C. Some diseases
D. All farmland
29. A. animals
B. plants
C. forests
D. people
30. A. must be true
B. will come true
C. can't be true
D. may be wrong
31. A. happens
B. develops
C. exists
D. appears
32. A. settling
B. working out
C. answering
D. dealing
33. A. no
B. still
C. less
D. plenty of
34. A. about
B. in
C. out
D. for
35. A. working
B. suggesting
C. spending
D. waiting
:
第三节:阅读理解
认真阅读下列短文, 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。
A
Travel is exciting and summer is a busy period for holiday travel. Many people will travel great distances in airplanes, cars or other vehicles. Experts say people should know about other health problems that can strike when traveling by air.
One of these is a condition called hypoxia (缺氧症). It results from a lack of oxygen to the brain. Experts say the body begins losing oxygen minutes after an airplane leaves the ground. The air pressure in a plane during flight is lower than at sea level. This makes it more difficult for the body to effectively use the same amount of oxygen as it would on the ground. Fewer oxygen molecules (分子) cross the tissues (组织) in the lungs and reach the bloodstream.
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