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【单选题】

The new study in this passage shows that______.

A.
many Americans are very practical when they search for a spouse
B.
American 20-somethings have a largely romantic view of marriage
C.
Romantic view of marriage might lead marriage to a happy ending
D.
Americans are fond of marriage life so they will not care cohabitation
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【单选题】下列关于第四号染色体的说法,不正确的是 ( ) 。

A.
第四号染色体的测序工作于2001年4月启动
B.
水稻基因组第四号染色体的序列分析结果,可获得大量的农作物遗传信息和功能基因
C.
水稻四号染色体着丝粒序列地完整测定,是迄今首次完成的高等生物染色体着丝粒序列
D.
我国采用克隆步移法完成了对水稻基因组第四号染色体全长序列的精确测定

【单选题】Danny didn't say anything about the matter to Mrs.Green because______.

A.
she had known it
B.
the other boys told her
C.
he didn't want to be in trouble
D.
his mother didn't want him to say it

【单选题】上海证券交易所成立于( )

A.
1985年12月
B.
1990年12月
C.
1991年1月
D.
1991年6月