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问题 选择题

科学家将雌黑鼠乳腺细胞的细胞核移到白鼠去核的卵细胞内，待发育成早期胚胎后移植入褐鼠的子宫内．最后产下的小鼠的体色和性别分别是（　　）

A．黑色，雌性

B．褐色，雌性

C．黑色，雄性

D．白色，雌性

答案

答案：A

题目分析：基因控制生物的性状，基因在DNA上，DNA在染色体上，染色体在细胞核里，细胞核是遗传信息库．小鼠体内的遗传物质来源于雌黑鼠乳腺细胞的细胞核．因此小鼠的体色与性别是黑色、雌性．

故选：A

填空题

Blair Admits Never Having Sent Flowers to His Wife


British Prime Minister Tony Blair admitted on a television programme that he has never sent flowers to his wife Cherie and that he had a youthful crush on Hollywood beauty Grace Kelly.
Blair, who allowed Channel 4 interviewer June Sarpong to shadow him for two days last month, made other personal (1) when asked questions he rarely hears on the usual television political (2) .
During the interviews for a program targeting 18-30 year (3) , the prime minister admitted he sometimes has to "wing it" when (4) public appearances and that he yearns to go out for a drink (5) being recognised.
However, the most dramatic revelation was his reply to Sarpong’s (6) on whether he still sends his wife flowers, prompting his interviewer to (7) in disbelief. "I’ve never sent her flowers. If I sent her flowers, she would (8) worried," Blair said.
But he added: "I am romantic. There are other ways of (9) romantic."
Blair needed a few moments to recall which posters he had (10) his bedroom wall as a youngster, then revealed: "I’ll tell you... actually, (11) I was younger, I loved Grace Kelly."
Born in 1929, Kelly (12) in films like ’Dial M For Murder’, ’Rear Window’ and ’High Society’ in the mid-1950s, but (13) acting to marry Prince Rainier of Monaco in 1956, when Blair was (14) two years old.
Blair admitted he initially found it "odd" to be (15) minister and to be rushed in motorcades from appointment to (16) , and worried that his lifesty left him "a bit isolated" from (17) people.
He admitted that he was constantly on the phone between public (18) , and rarely had time to prepare for his next (19) , telling Sarpong: "I wing it all the time."
And he revealed he has to check himself before he replies to (20) questions from the public. "The worst thing is when someone is giving you a real earful and you think ’I’m going to say something I will regret’," he said.
Asked what he would do if he could be invisible for a day, Blair yearned for a more ordinary life, saying he would "just walk down the street and go to the pub... just be absolutely normal".
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单项选择题

根据电容充放电的原理，可用指针式万能表的哪一测量档来测量电容器的好坏（）

A.直流电压文件

B.电阻档

C.交流电压文件

D.电流档
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