The main topic of this passage is about______.
A. the biological differences between men and women
B. the differences in social roles between men and women
C. the differences in living habits between men and women
D. the challenges men and women face from the point of view of biology
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We can infer all of the following EXCEPT that ______.
A. the difference in bone structure reflects differences in their social roles
B. men appear to be braver than women partly because of biological reasons
C. men have a larger appetite than women do
D. men fall ill more often than women because of their deep breathing
就51岁以上的农业从业人员来说。中部地区比东部地区多多少万人？
A. 31.55
B. 34.44
C. 37.33
D. 40.22
假如每个地区的每个年龄层的性别构成都是一样的，那么中部地区21-30岁女性农业从业人员有多少万人？
A. 764.78
B. 923.51
C. 1408.43
D. 5541.86
根据所给材料，下列说法中正确的有：
A. 1997-2008年，重庆市进出口总值年均增速超过实际利用外商直接投资额
B. 1997-2008年，重庆市进出口总值增长量最小的一年是2001年
C. 2008年，重庆市进口总值比上年增长28.0%
D. 1996年，重庆市实际利用外商直接投资额为2.28亿美元
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