下面对受精作用的描述不正确的是[ ] A.受精作用是卵细胞和精子相互识别、融合成

题型:选择题

问题:

下面对受精作用的描述不正确的是[ ]

A.受精作用是卵细胞和精子相互识别、融合成为受精卵的过程

B.受精卵中的染色体一半来自父方,另一半来自母方

C.受精卵中的DNA一半来自父方,另一半来自母方

D.一个卵细胞一般只能与一个精子结合形成受精卵

考点:受精作用
题型:选择题

磺酰脲类药物和下列哪些药物合用时可以产生相互增强作用:

A.磺胺类药

B.利血平

C.保泰松

D.奎尼丁

E.苯巴比妥

题型:选择题

龙门剪板机上下剪刃之间的间隙应根据被剪切钢板的()来定。

A、宽度

B、长度

C、材质

D、厚度

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Whether you’re eating at a fancy restaurant or dining in someone’s home, proper table manners are likely to help you make a good impression. According to a US expert, Emily Post, “All rules of table manners are made to avoid ugliness.”

While Henry Hitchings of the Los Angeles Times admits that good manners can reduce social conflict, he points out that mostly their purpose is protective – they turn our natural warrior-like selves into more elegant ones.

So where did table manners come from?

In medieval England, a writer named Petrus Alfonsi took the lead to urge people not to speak with their mouths full. And King David I of Scotland also proposed that any of his people who learned to eat more neatly be given a tax deduction (减除).

Disappointingly, that idea never caught on. It was during the Renaissance, when there were real technical developments, opinions of correct behavior changed for good. “None of these was more significant than the introduction of the table fork,” wrote Hitchings. “Gradually, as forks became popular, they brought the new way of eating, making it possible, for instance, to consume berries without making one’s fingers dirty.”

Forks were introduced to Britain in 1608 and 25 years later, the first table fork reached America. Yet while most of the essentials (基本要素) are the same on both sides of the Atlantic, there are a few clear differences between what’s normal in the US and what holds true in the UK. For example, in the US, when food needs cutting with a knife, people generally cut a bite, then lay aside the knife and switch the fork to their right hand. Then they pick up one bite at a time. By contrast, Britons keep the fork in the left hand and don’t lay the knife down.

Though globalization has developed a new, simpler international standard of table manners, some people still stick with the American cut-and-switch method.The Los Angeles Times noted, “They are hanging on to a form of behavior that favors manners above efficiency.”

小题1:What does the story mainly talk about?

A.The importance of proper table manners .

B.The development of table manners in Western countries.

C.Some unwritten rules of table manners in the US and UK.

D.Differences between American and British table manners.小题2: The underlined phrase “caught on” in the passage probably means ______.

A.worked in practice

B.became popular

C.drew attention

D.had a positive effect小题3:Which of the following events influenced people’s table manners most according to the article?

A.The introduction of forks.

B.The tax deduction policy.

C.The rise of the Renaissance.

D.Petrus Alfonsi’s efforts in promoting table manners.小题4:What can we conclude from the article?

A.British and American table manners are completely different from each other.

B.American people pay more attention to their table manners than British people do.

C.With globalization, the American cut-and-switch method has been abandoned in the US.

D.British people’s way of using a knife and fork may be more efficient than American people’s.

题型:选择题

下列情形中,应当被注销执业医师注册的是()。

A.中止医师执业活动满1年的

B.在医疗事故中负有民事赔偿责任的

C.受暂停执业6个月行政处罚的

D.受罚款行政处罚的

E.构成医疗事故罪而被判处刑罚的

题型:选择题

运行中的电流互感器。当一次电流在未超过额定值1.2倍时,电流增大,误差()。

A.不变

B.增大

C.变化不明显

D.减小。

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