Only in the way______solve the problems.
A. we can
B. can we
C. would we
D. we would
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You will pass the examination if you______harder.
A. will study
B. study
C. studied
D. would study
Why does the author mention "there is wide-spread uneasiness and confusion"(Para. 1)？______
A. The abundant food supply is not expected to last
Britain is importing less food
C. Despite the abundance, food prices keep rising
D. Britain will cut back on its production of food
Which of the following is closest to the meaning the text tries to convey？
A. Every innovation deserves patent protection.
B. Patents are for huge advances and improvements.
C. Not every copycat deserves a punishment.
D. It is dishonorable to steal others" ideas.
不能使心排血量增加的因素是（）
A. 前负荷增加
B. 后负荷增加
C. 心率增快10%
D. 体内儿茶酚胺增加
E. 回心血量增加
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