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问题 单项选择题

好的杀鼠剂应该具备的条件是（）。

A.毒力适中

B.毒性强

C.容易二次中毒

D.有刺激性气味

答案

参考答案：A

选择题
Two thirds of the subway construction ____ so far and people will enjoy a fast and convenient trip under the city early next year.

A. have been completed
B. is being completed
C. has been completed
D. will be completed
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问答题 简答题

判断公路路政管理专用车辆的示警灯为红、黄、蓝三色。固定排列，排灯颜色左右两侧对称分布，请判断：排灯从里向外依次为红色、黄色、蓝色。排灯顺序是否正确？
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