滴眼后15～60min可见瞳孔缩小：
A．地美溴铵
B．他克林(tacrine)
C．二者都可
D．二者都不可
参考答案：A
生活在沙漠中的仙人掌茎肉质化，叶变态成刺是对______的适应．蚯蚓的钻穴运动能改良土壤是对______的影响．鼠妇是生活在______的环境中的．
Our country, together with others in the Third World,________ hard to build a harmonious homeland
for human beings now.[ ]
A. work
B. working
C. is working
D. are working
