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【单选题】
It is curious how often sympathy for the old and infirm takes a form. which actually humiliates them. Their friends, with good will, sometimes lean forward to rearrange their neckwear, touching their hair or patting their faces—things they would never presume to do, unasked, to one of their contemporaries. An equally humiliating habit is to talk about old people in front of them as if they were not there, discussing their health. It is now universally accepted that children should be encouraged to do as much as they can for themselves in order to develop their brains and muscles, but so few people today seem to have time to allow the elderly the same means of keeping their minds and muscles active. They perform. innumerable services for the old that they would be much better left to do, even with a struggle, for themselves. Convenient flats, 'motherly' visitors, or organized entertainments cannot make up for the fundamental need which must be satisfied—the need to retain to the end of life human dignity and the respect of one's fellows. Many people are not aware that it is rather rude to ______.
A.
talk casually about old people in front of them as if they were not there
B.
show sympathy for the old
C.
take care of the old when they are not ill
D.
pat the faces of the contemporaries
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【单选题】我国第二大淡水湖是(   )
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武汉东湖
B.
洞庭湖
C.
嘉兴南湖
D.
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【单选题】我国第二大淡水湖是()。
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鄱阳湖
B.
洞庭湖
C.
洪泽湖
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B.
颈段很短,主要为中心力粒
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末段只有轴丝
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是精子的运动装置
B.
颈段很短,主要为中心粒
C.
中段短,主要由轴丝和线粒体鞘构成
D.
主段长,主要由轴丝、线粒体鞘和纤维鞘构成
E.
末段只有轴丝
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【单选题】关于精子尾部的描述,哪一项错误()
A.
是精子的运动装置
B.
颈段很短,主要为中心粒
C.
中段短,主要由轴丝和线粒体鞘构成
D.
主段最长,主要由轴丝、线粒体鞘和纤维鞘构成
E.
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【单选题】关于精子尾部的描述哪项错误()。
A.
是精子的运动装置
B.
可分为颈段、中段、主段和末段
C.
线粒体为精子运动提供能量
D.
中段最长
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A.
阳湖
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洪泽湖
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A.
轴丝 是精子运动的主要装置
B.
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C.
构成尾部全长的轴心是轴丝
D.
线粒体是精子的能量供应中心
E.
中段最长
【单选题】我国第二大淡水湖是( )。
A.
鄱阳湖
B.
太湖
C.
洪泽湖
D.
洞庭湖
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