（），结友何须多！（曹植《野田黄雀行》）
参考答案：利剑不在掌
—Do you usually wash clothes at home?
—Yes, although I think it's _______, I have to help my mother. [ ]
A. necessary
B. boring
C. exciting
D. interesting
毛果芸香碱
A．M受体激动药B．α、β受体激动药C．N2受体激动药D．M受体阻断药E．胆碱酯酶抑制药
