不易通过血-脑脊液屏障，对平滑肌解痉作用的选择性相对较高（）
A．东莨菪碱
B．山莨菪碱
C．氯琥珀胆碱
D．阿托品
E．乙酰胆碱
参考答案：B
—How are things going?
—The disabled ________ no relatives in Guangzhou ________ by the volunteers, who will graduate from Zhongshan University next year.
A．with, are taking care of
B．have, will be taken care of
C．with, are being taken care of
D．have, are being taken care of
丁二烯储存时需注意事项有（）等。
A.阴凉通风
B.远离火种、热源
C.装贮系数不得超过95%
D.紧闭容器
