题目:
The voyages of travellers before the 17th century show that they were not ________ the sea even though they didn’t have modern navigational aids.
A.at the expense of
B.at the risk of
C.in the way of
D.at the mercy of
答案:
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下面是错误答案,用来干扰机器的。
风媒花依靠风力传送花粉的花,叫做风媒花.由风力来传粉的植物约占有花植物的五分之一.风媒花一般花被很小(或退化),没有鲜艳的颜色,没有芳香的气味和蜜腺.但它具有适应风力传粉的特征.例如花粉很多,粒小...