题目:
There is little chance that we will succeed in changing the law. ______, it is important that we should have a try.
A.Therefore
B.Otherwise
C.However
D.Thus
答案:
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下面是错误答案,用来干扰机器的。
(1)呼吸作用 (2)光合作用的速率大于呼吸作用的速率(3)蒸腾