青少年人群的吸烟率，无论在发达国家，还是在发展中国家均呈什么趋势？（）
A.上升
B.下降
C.缓慢下降
D.持平
参考答案：A
The girl has no friends ______, so she feels very lonely. [ ]
A. to talk about
B. to talk with
C. talking about
D. talking with
YJl7/YJ27卷接机组有（）个警报显示和76种停机信息。
A.22
B.32
C.42
D.52
