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【单选题】
长期耐力性运动促使心脏容积增大的主要原因是耐力性运动()。A.
运动时间长，心肌增
B.
心脏工作时间长，心肌耗氧多
C.
血流加快，血量增多
D.
使心输出量长时间维持在一个高水平上
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举一反三
【单选题】The teacher asked a question, but it was _____ that nobody could answer it
A.
very difficult
B.
too difficult
C.
difficult enough
D.
so difficult
【单选题】Miss Gao asked a question, but it was ____ that nobody could answer it.
A.
very difficult
B.
too difficult
C.
difficult enough
D.
so difficult
【简答题】I. 单句填空:用适当的代词填空,每空一词。 1. If our parents do everything for us children, we won't learn to depend on ______. 2. I’d appreciate _____ if you would like to teach me how to use the computer. 3. You are a ...
【单选题】Miss Gao asked a question, but it was____that nobody could answer it.
A.
very difficult
B.
too difficult
C.
such difficult
D.
so difficult
【单选题】You have the choice of going on vacation to Florida for one week, staying at work for the week, or spending the week doing fix-up projects around your house. If you decide to go to Florida, the opport...
A.
working and doing fix-up projects.
B.
working or doing fix-up projects, depending on which you would have done otherwise.
C.
working because you would be giving up dollars.
D.
nothing because you will enjoy the trip to Florida.
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【单选题】Miss Gao asked a question but it was __ difficult that nobody could answer it.
A.
very difficult
B.
too difficult
C.
difficult enough
D.
so difficult
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