下列细胞中,能够发生质壁分离的是() A.人的口腔上皮细胞 B.洋葱根尖分生区细胞

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问题:

下列细胞中,能够发生质壁分离的是()A.人的口腔上皮细胞B.洋葱根尖分生区细胞C.洋葱鳞片叶表皮细胞D.干种子细胞

A.人的口腔上皮细胞

B.洋葱根尖分生区细胞

C.洋葱鳞片叶表皮细胞

D.干种子细胞

考点:高中生物物质进出细胞的方式物质进出细胞的方式题库
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汇集有全市性的行政、商业、文化等设施,是信息、交通、物资汇流的枢纽,也是第三产业密集的区域是()。

A.专业性公共中心

B.城市公共中心

C.中央商务区(CBD.

D.全市性公共中心

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有一只电灯泡标有“220V 40W”的字样,当灯泡正常发光时,流过灯泡的电流为______安,每分钟消耗的电能为______焦,此时灯丝电阻为______欧.

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一只小虫爬行a厘米后右转弯144°,再爬行a厘米后右转弯144°,…,如此爬行知道爬回原处,共爬行了100厘米.则a=______.

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阅读理解。

      A blind boy sat on the steps of a building with a bosh by his feet. He held up a sign which read, "I am

blind, please help." There were only a few coins in the box. The boy felt sad.

      A man walked by. He took a few coins from his pocket and dropped them into the box. Then he took

the sign, turned it around and wrote some words. He put the sign back so that everyone who walked by

would see the new words.

      Soon the box was full. A lot more people were giving money to the blind boy.

      That afternoon the man who had changed the sign came to see how things were. The boy recognized

his footsteps (听出他的脚步声) and asked, "were you the one who changed my sign this morning? What

did you write?"

      That man said, "I only wrote the truth. I said what you said but in a different way." What he had written

was, "today is a beautiful day and I can not see it."

       Do you think the first sign and the second sign were saying the same thing? Of course both signs told

people they were so lucky that they were not blind.

       Great men say, "In the journey of life, if you want to travel without fear, you must have the ticket of a

good conscience (良心)."

       It's a beautiful thing to see a people smiling! And it's even more beautiful to know that you are the

reason of a person's smiling!

1. When did the man pass by and change the blind boy's sign? [ ]

A. In the morning

B. At noon

C. In the afternoon

D. At night

2. Why did the second sign have a better effect? [ ]

A. It told the truth in a straight way.

B. It told the passing people a lie.

C. It told people to buy some tickets for the boy.

D. It told people to feel lucky for not being blind.

3. What do the first three paragraphs tell us? [ ]

A. No pains, no gains.

B. Different ways, different results.

C. The early bird catches the worm.

D. When the cat's away, the mice will play.

4. According to the last paragraph, the most beautiful thing is _____. [ ]

A. to know the reason of a person's smiling

B. to see a person smiling

C. to be the reason of a person's smiling

D. to be a person smiling

题型:单项选择题

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