腹部脏器中最容易受损伤的器官是（）
A.肝
B.脾
C.胰
D.肾
E.膀胱
参考答案：B
—What clothes do you put on in summer?
—________.[ ]
A. A coat and shorts.
B. A sweater and pants.
C. A T-shirt and a pair of shorts.
D. A scarf and boots.
安装井架和井架上的设备时，为什么井口必须盖严？
