既能解表，又能止痉的药物是（）。
A.白芷
B.蝉蜕
C.葛根
D.荆芥
E.防风
参考答案：B, E
Not until a large piece of stone fell from the Sphinx's right shoulder ______.
A．did the Sphinx begin to be damaged
B．did the experts take steps to protect it
C．did the polluted air begin to damage it
D．did the Sphinx begin to draw people's attention
B超下胚芽的早期图像见于：
A．妊娠4周
B．妊娠5周
C．妊娠6周
D．妊娠8周
E．妊娠12周
