肺胀的发病基础（） A.肺虚 B.脾虚 C.肾虚 D.肺脾两虚 E.

阅读短文，回答问题。

                                                                     Who Is Clever?

        Miss Helen taught physics in a school of London. Last week she was explaining to her classes about sound,

and then she decided to test them to see how successful she had been in her work. She said to them, "Mow, I

have a sister in New York. If I was calling her on the telephone, and at the same time you were 20 metres away,

and listened to me from the other side of the street. Who do you think would hear what I said earlier, my sister

or you, and why?" 

       One of the cleverest boy answered at once, "Your sister, Miss Helen, because electricity travels faster than

sound waves." 

       "That's very good," Miss Helen said. But then one of the girls put up her hand, and Miss Helen said, "Yes,

Molly." "I don't think so," Molly said. "Your sister would hear you later because when it's eleven o'clock here,

it's only six o'clock in New York."

1. Miss Helen was explaining about _______. [ ]

A. telephone

B. electricity

C. time

D. sound

2. Helen's sister is in _______. [ ]

A. London

B. England

C. Washington

D. New York

3. Who can hear Miss Helen earlier according to the boy's answer? [ ]

A. Helen's sister

B. the boy

C. Molly

D. the student

4. Molly thought _____ would hear earlier. [ ]

A. Helen

B. Helen's sister

C. the student

D. nobody

5. When it's seven o'clock in London, it's ______ o'clock in New York. [ ]

A. two

B. six

C. three

D. twelve

肺细胞中的let-7基因表达减弱，癌基因RAS表达增强，会引发肺癌。研究人员利用基因工程技术将let-7基因导入肺癌细胞实现表达，发现肺癌细胞的增殖受到抑制。该基因工程技术基本流程如图1。

请回答：

(1)进行过程①时，需用______ 酶切开载体以插入let-7基因。载体应有RNA聚合酶识别和结合的部位，以驱动let-7基因转录，该部位称为_________。

(2)进行过程e时，需用________酶处理贴附在培养皿壁上的细胞，以利于传代培养。

(3)研究发现，如let-7基因能影响癌基因RAS的表达，其影响机理如图2。据图分析，可从细胞中提取_______进行分子杂交，以直接检测let-7基因是否转录。肺癌细胞增殖受到抑制，可能是由于细胞中_________(RASmRNA/RAS蛋白质)含最减少引起的。

消渴病并发中风偏瘫的机理是（）

A.燥热内结，营阴被灼，络脉瘀阻，蕴毒而成

B.肾阴亏损，肝失濡养，肝肾精血不足，无以上承

C.阴虚燥热，肺失滋润

D.阴虚热炽，炼液成痰，痰阻经络，蒙蔽心窍

E.阴损及阳，脾肾衰败

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