______had he arrived home than it began to rain.
A. Not until
B. No sooner
C. Scarcely
D. hardly
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Health depends ______good food, fresh air and enough sleep.
A. from
B. up
C. on
D. over
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关于牵张反射的描述,下列选项正确的有()
A.感受器存在于支气管和细支气管的平滑肌层
B.兔的牵张反射明显
C.正常人平静呼吸时,此反射对控制呼吸节律起重要的调节作用
D.该反射促使吸气及时转入呼气
E.传人纤维在迷走神经干中上行至延髓
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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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钢筋的力学性能指标包括___________、___________、___________、___________,其中___________和___________是检验钢筋塑性性能的两个指标。
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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