【題目】The river becomes rapid as it passes __________ deep valleys, travelling __________ western Yunnan Province.

A. over; through B. through; across

C. across; through D. through; over

【答案】 B

【解析】句意：當(dāng)河流穿過深谷，跨過云南省西部時(shí)，突然變得湍急。through從中穿過；across. 從平面的一邊到另一邊。

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