清热燥湿兼能杀虫的药物是（）
A.苦参
B.黄连
C.龙胆草
D.黄柏
E.秦皮
参考答案：A
Hi, Peter! I haven't heard much from you lately. What ______ you ______? [ ]
A. have…done
B. have… been doing
C. did…do
D. are…going to do
滑动轴承的温度≥（）℃应报警。
A.≥55
B.≥80
C.≥70
