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问题 单项选择题

猪肝含高量的

A．铁质

B．硫

C．钠

D．镁

答案

参考答案：A

填空题
在正项等比数列an中，a1＜a4=1，若集合A={n|(a1-
1
a1
)+(a2-
1
a2
)+…+(an-
1
an
)≤0，n∈N*}，则集合A中元素的个数为______．
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选择题

Lucy: Does Aunt Tara enjoy 　　　?

Mark: Yes.  She has three dogs, two rabbits, four birds, and some fish in her house.

A．collecting dolls

B．keeping pets

C．visiting the zoo

D．working on the farm
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