谷胱甘肽过氧化物酶中含有（）
A.铜
B.锌
C.硒
D.碘
E.铁
参考答案：C
We can't visit the China Space Museum because the price of the ticket is too ________.[ ]
A. cheap
B. expensive
C. high
D. tall
养老护理员的礼仪要求有哪些？
