Thevoyagesoftravellersbeforeth-优题课

The voyages of travellers before the 17^th 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

科目英语题型单选题难度较难

知识点：介词

When the Eiffel Tower was shown in 1889 at the world exposition, it was not very popular and came close to ______ down.

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There is strong evidence that the of a father increases the probability that a youngster will use drugs and engage in criminal activity.

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