问题
单项选择题
My main aim in life（）a good husband and father.
A.is to
B.is
C.to
D.is to be
答案
参考答案：D
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My main aim in life（）a good husband and father.
A.is to
B.is
C.to
D.is to be
参考答案：D
Ｐａ，瓶口面积Ｓ＝
，熟鸡蛋重力Ｇ＝０．５０Ｎ．求： 