第21题: [填空题]Because of the recent accidents, our parents forbid my brother and me from swimming in the river unless someone agrees to watch over us.
A. Because of B. swimming C. unless D. to watch 参考答案:B,改against swimming为to swim。 答案解析:[试题分析] 本题考查对惯用搭配的掌握。
[详细解答] forbid sb. to do sth.为固定搭配,意为“禁止某人做某事”。
第22题: [单项选择]ETC频率为()。 A. 5.8G B. 1.2G C. 2.4G D. 280M 参考答案:A