以下滑囊哪一项与膝关节腔相通：（）
A.髌上囊
B.髌前皮下囊
C.髌前筋膜下囊
D.髌前腱下囊
E.髌下囊
参考答案：A
The fact that she was foreign made ______ difficult for her to get a job in that country.
A．this
B．that
C．her
D．it
气象雷达风切变功能在什么阶段起作用（）.
A.飞行全过程
B.起飞时
C.进近时
D.起飞和进近时
