问题 问答题 简答题

在人的一生中先后有哪几组牙?萌出时间如何?

答案

参考答案:

第一组称为乳牙,一般在生后6个月开始萌出,3岁出齐,6~7岁开始脱落换牙。第二组称为恒牙,约在6~7岁第一磨牙首先萌出,12~13岁恒牙逐步萌出并替代全部乳牙;唯有第三磨牙要14~28岁间才萌出,故又称迟牙或智牙。

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Brave Frenchman Found Half-way Around the World

(NEW YORK) A French tourist highly praised for rescuing a two-year-old girl in Manhattan said he didn’t think twice before diving into the freezing East River.

Tuesday’s Daily News said 29-year who left the spot quickly after the rescue last Saturday.

He lifted the little girl out of the water after she fell off the bank at the South Street Scaport museum. He handed the girl to her father ,David Anderson, who had dive in after him.

“I didn’t think at all,”  Duret told the Daily News. “ It happened very fast. I reacted very fast.”

Duret, an engineer on vacation ,was walking with his girlfriend along the pier(码头)when he saw something falling  into the water .He thought it was a doll, but realized it was a child when he approached the river. In an instant ,he took off his coat and jumped into the water.

When he reached the girl, she appeared lifeless, he said . Fortunately, when she was out of the water, she opened her eyes.

Anderson said his daughter slipped off the bank when he was adjusting his camera. An ambulance came later for her, said Duret, who was handed dry clothes from cookers. Duret caught a train with his girlfriend shortly after.

The rescue happened on the day before he left for France. Duret said he didn’t realize his tale of heroism he was leaving the next morning .

“I don’t really think I’m a hero,” said Duret. “Anyone would do the same ting.”

1.why was Duret in NewYork?     

A. To meet his girlfriend              B. To work as an engineer

C. To spend his holiday               D. To visit the Andersons.

2. What did duret do shortly after the ambulance came?             

A. He was interviewed by a newspaper

B. He asked his girlfriend for his dry clothes

C. He went to the hospital in the ambulance

D. He disappeared from the spot quickly

3. Who divide after duret into the river to save the little girl?        

A. David Anderson   B. a passer-by    C. his girlfriend     D. a taxi driver.

4. When was duet most probably found to be the very hero?        

A.  the day when he was leaving for home.

B. a couple of days after the girl was rescued

C. the first day when he was in New York

D. the same day when he was interviewed.