腹股沟直疝三角(海氏三角)是由下列哪些结构组成的
A．腹白线
B．腹直肌外缘
C．腹壁浅静脉
D．腹壁下动脉
E．腹股沟韧带
参考答案：B,D,E
________ smoke can make you terrible. [ ]
A. Many
B. A lot
C. A little
D. A few
Seeing their son playing computer games all day, the parents don’t know ______ it.
A．how to do
B．what to do
C．how to deal with
D．how to do with
