饮片外表面较为光滑的药材为
A．川木通B．秦皮C．石菖蒲D．苦参E．百部
参考答案：E
—You're coughing badly. Have you gone to see a doctor?
—No, but I ______. [ ]
A. am going to
B. will not
C. am not going to
D. haven't
大约有( )的孤独症患者患有某种程度的精神发育迟滞。
A．10%
B．55%
C．75%
D．85%
