I prefer writing a term paper ________ taking an examination.
A. than
B. to
C. for
D. rather than
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二尖瓣狭窄()
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______had he arrived home than it began to rain.
A. Not until
B. No sooner
C. Scarcely
D. hardly
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Ⅲ. Cloze (20 points)
Directions: For each blank in the following passage, there are four choices marked A, B, C and D. Choose the one that is most suitable and mark your answer by blackening the corresponding letter on the answer sheet.
We are interested in the weather because it (21) us so directly—what we wear, (22) we do, and even how we feel. Geographers, however, are (23) interested in climate than in weather. Climate is the pattern of all the weather conditions over a long period of time. Generally (24) , climate (25) to these normal weather conditions, not (26) daily or yearly changes.
Climate, like weather, changes (27) time. It is true (28) these changes (29) a long time, but not as long as we might expect. Records show that over the centuries large portions of the earth have experienced great changes (30) climate.
21. A. effects
B. defects
C. infects
D. affects
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纤维溶解系统的成分有()
A.纤维蛋白降解产物
B.纤溶酶
C.纤溶酶原
D.抑制物
E.激活物
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Health depends ______good food, fresh air and enough sleep.
A. from
B. up
C. on
D. over