A.Lower temperatures and more rainfall.
B.Higher temperatures and higher humidity.
C.Making a record both in the past and now.
D.The two periods of the 40year investigation.
21.Which of the following could be the possible sources for the increased moisture in the US Midwest?
A.Scientists' research and farmers' attention.
B.Less farmland and more plants.
C.More plants and irrigation practices.
D.Natural reservoirs and underground rivers.
22.The studies show that in America's Midwest,________g higher and higher
B.more and more farmland has been deserted
C.the amount of rain is closely related to the temperature
D.summers are now cooler and wetter than they were in years past
23.According to the passage, irrigating more and more plants means ________.
A.making more space for farms and buildings
B.making more and more water into the air, and thus causing more rain
C.more farms depending on watersaving systems
D.using plants to change the climate
Ⅲ.短文填词a Kenyan athlete 24.n________ Kip Keino competed in the 15,000 meters running race. At that time, he was very ill and ________ great pain. Although he had reached the standard for the final of the race, he decided at first 26.________ to take part. However, just before the race was going to start, he changed his 27.________. He ran from his room and 28.a________ at the race track a few minutes before the race was about to begin. 29.________ (令人惊讶地), he won the race, finishing well ahead of everyone else and showing what ________ (真正的) courage and perseverance can achieve. It was no ________ that he became the only Kenyan sportsman ever to appear on the 32.c________ of the world famous sports magazine Sports Illustrated and he was 33.a________ by people all over the world.
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