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【单选题】
进入左侧道路超车,无法保证与正常行驶前车的横向安全间距时,应 。A.
加速超越
B.
并行一段距离后再超越
C.
放弃超车
D.
谨慎超越
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【单选题】听力原文： Recently. a man who was always i13 good health, spent a week in bed with severe flu. It was tile worse illness in his 1ife. The previous week, he and his wife separated. (30)It seems his unusual...
A.
How people fall ill.
B.
The influence of people's emotions on their health.
C.
A new method to cure breast cancer.
D.
Several ways to keep fit.
【单选题】We may infer from the fourth paragraph that
A.
humans have been growing food crops more than ten thousand years.
B.
humans have learned how to produce biofuels for a long time.
C.
humans are just on the beginning of making biofuels.
D.
a cell wall includes four hemicellulose.
【单选题】听力原文： Recently, a man who was always in good health, spent a week in bed with severe flu. It was the worse illness in h is life. The previous Week, he and his wife separated. (30)It seems his unusual ...
A.
How people fall iii.
B.
The influence of people's emotions on their health.
C.
A new method to care breast cancer.
D.
Several ways to keep fit.
【简答题】双极型三极管实现放大作用的重要参数是（）。
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