很多人可能没听过“单宁”这个词，但是一定体验过它产生的“涩味_爱下问搜题

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问题单项选择题

很多人可能没听过“单宁”这个词，但是一定体验过它产生的“涩味”。红葡萄酒、茶、柿子、石榴、蓝莓、坚果——大凡来自植物尝起来涩的东西，基本上就是它在作怪。植物为什么含有单宁，从进化的角度和植物生理的角度都众说纷纭。如果从结果来看，至少它对于植物是一种保护。对于哺乳动物来说，涩并非是一种享受，也就不怎么喜欢吃。另一方面，单宁本身有一定的毒性，可以杀死附着的微生物。即使是哺乳动物，吃得太多也会生病。
这段文字主要说明：

A．“单宁”是植物中含有的一种能使其变涩的物质
B．对于植物中含有单宁的原因至今尚无一致的结论
C．植物中含有单宁对植物本身而言是一种保护
D．单宁本身有一定毒性，吃得太多对健康无益

答案

参考答案：C

解析：文段先由植物中的涩味引出“单宁”这一物质，然后重点从结果的角度分析了植物中含有单宁的原因，即“从结果来看，至少它对于植物是一种保护”，C项符合文意，当选。

单项选择题 B1型题

君相火旺型遗精的治法是（）。

A.温肾壮阳，滋肾填精

B.补益心脾

C.益肾宁神

D.调补心脾，益气摄精

E.清心安神，滋阴清热

完形填空

完形填空（共20小题，每小题1 分，共计20分）
Having lived in the house for so long, we found our kitchen looked    21   . We decided it was time to   22  the kitchen, and my husband and I were discussing   23  colors. The children, sitting nearby, suddenly all spoke together：“Not the measuring stick. ”
“No,” I   24   them. “Not the measuring stick.”
The measuring stick isn’t a (an)   25    stick but the kitchen side of the door between our kitchen and dining room. Along the edge we’ve   26   each child’s growth by making a mark showing his or her   27   on every birthday. Over the years, so many colored pens, pencils and    28     have been used that now, this white door is somewhat like an abstract(抽象的) painting.
Names and dates show different    29   , and I can tell by the script(手迹) who measured whom. An eight-year-old   30  to measure her three-year old sister, a grandchild measured her grandmother and my husband did the same to me. At our family    31   , when this door swung back and forth frequently, friends used to stop to    32    the names and dates. When they were asked if they would like to be always remembered, they    33    smiled shyly and went back right up into place,     34 to be measured.
Many of those   35    on the door are still   36   . Some have stopped. Some remain with us only in   37   . When my mother came to see my eldest daughter graduate from university, we measured her, too. It was her last visit to our home.
We haven’ t   38   the new kitchen color plan yet, but one thing is certain: whatever color we choose, the   39   of the kitchen door will still remain    40  , with lots of names and dates in various colors.

D． changeable

D． accompanied

C． schoolbags

A．information	B． handwriting
C．character	D． status

B．contributing

A．connected with	B．agreed to
C．decided on	D．relied on