【题目】 Temperatures________ quite dramatically at night in mountains, so put on some warm clothes before going out.
A. are dropped B. drop
C. are being dropped D. have dropped
在线课程【答案】B
【解析】
试题分析：句意：山里的气温晚上下降得厉害，所以出门前穿上一些暖和的衣服。山里的气温到晚上骤降是自然状况，应该用一般现在时的主动语态。故选B。