桔梗的作用是
A．润肺止咳，下气化痰B．宣肺利咽，清肺化痰C．宣肺利咽，祛痰排脓D．降气止咳，祛痰排脓E．降气止呕，祛痰排脓
参考答案：C
重要航空天气预报高层、中层、低层的高度为多少？
Questions 11 to 18 are based on the conversation you have just heard.
A．She doesn’t believe he can do it.
B．She agrees with the man.
C．She expects to see him soon.
D．She will go to the library.
