艾丁湖1万多年来变迁的主要原因是

【名词&注释】

蕨类植物(pteridophyte)、维管束(vascular bundle)、双子叶植物(dicotyledon)、多年来(many years)、中柱鞘(pericycle)

[单选题]艾丁湖1万多年来变迁的主要原因是

A. 围湖造田
B. 绿洲萎缩
C. 湖区汇水面积减少
D. 气候变干

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学习资料：

[单选题]根据下面，回答45 ~48 题：BHaving a husband means an extra seven hours of housework each week for women, according to a new study. For men, getting married saves an hour of housework a week. “It’s a well-known pattern,” said lead researcher Frank Stafford at University of Michigan’s Institute for Social Research. “Men usually work more outside the home, while women take on more of the housework.”

B. Overall, times are changing in the American home. In 1976, women busied themselves with 26 weekly hours of sweeping-and-dusting work, compared with 17 hours in 2005. Men are taking on more housework, more than doubling their housework hours from six in 1976 to 13 in 2005.
C. Single women in their 20s and 30s did the least housework, about 12 weekly hours, while married women in their 60s and 70s did the most-about 21 hours a week.
D. Men showed a somewhat different pattern, with older men picking up the broom more often than younger men. Single men worked the hardest around the house, more than that of all other age groups of married men.
E. Having children increases housework even further. With more than three children, for example, wives took on more of the extra work, clocking about 28 hours a week compared with husbands’10 hours.
F. 第5题：According to the “well-known pattern” in Paragraph 1, a married man___________.
G. takes on heavier work
H. does more housework
I. is the main breadwinner
J. is the master of the house

[单选题]Playing on a frozen sports field sounds like a hot of fun. Isn’t it rather risky,____?

A. thought
B. also
C. either
D. too

[单选题]“视人之国，若视其国；视人之家，若视其家；视人之身，若视其身。”这一主张属于

A. 儒家“仁爱”思想
B. 墨家“兼爱”思想
C. 儒家“礼治”思想
D. 墨家“非攻”思想

[单选题]韭菜叶切断后，能继续生长，是因为下列何种生长的结果?( )

A. 顶端生长
B. 侧生生长
C. 居间生长
D. 产生离层

[单选题]下列哪个结构不是双子叶植物茎初生结构的维管柱所具有的( )。

A. 维管束
B. 髓
C. 中柱鞘^(pericycle)
D. 髓射线

[单选题]蕨类植物的叶有单叶也有复叶。( )

A. 正确
B. 错误

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