题目内容
9．There is an old bridge _______ the river．Be careful （小心） when you _______ it．（ ）| A． | over； across | B． | over； cross | C． | on； cross | D． | on； across |
分析 河上有座旧桥，过马路时要小心．
解答 答案：B．考查介词．句意"河上有座旧桥，过马路时要小心．"．over在…上方（表示垂直向上）．on 在…上面（ 与某物表面接触）．结合语境"河上有座旧桥"，应该用over，C，D不正确．第二个空，across介词，此空缺少谓语动词，因此A不正确．cross穿过、横渡，动词．答案是B．
点评 考查介词用法，这个知识点很广泛，有一些固定用法，需要日常积累，结合语境选择正确介词完成习题．
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