下列哪一味药口服后能产生微量氢氰酸，对呼吸中枢产生抑制而止咳平喘（）
A.桔梗
B.半夏
C.杏仁
D.款冬花
E.甘草
参考答案：C
--- Why did you buy two pairs of shoes?
--- It was so hard to choose which was________, so I took them both.
A．better
B．the better
C．worse
D．the worse
下列属于收养关系成立的实质要件是（）
A.当事人应当依法履行一定的收养手续
B.当事人应当依法具备一定的条件
C.当事人应当签订收养协议
D.收养人应当办理收养公证
