【題目】 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

【答案】B

【解析】

試題分析：句意：河上有一座古老的橋。當你過橋時要小心。over表示“正上方”，on是和物體接觸。cross 經(jīng)過,穿過； across是介詞，穿過。這里首先橋不與河接觸，其次的話是在正上方，而且是越過河的，后句話的“穿過”作動詞，故選B。

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