毛果芸香碱为__________受体激动药,使括约肌收缩而缩瞳,使回__________流通畅,从而降低眼压而治疗青光眼。
参考答案:M胆碱|房水
It is always difficult being in a foreign country, _____ if you do not speak the language. [ ]
A. extremely
B. naturally
C. basically
D. especially