龋病是牙体硬组织发生的哪种变化 A.以上都对 B.急性间歇性破坏 C.慢性间歇性破坏

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问题:

龋病是牙体硬组织发生的哪种变化

A.以上都对
B.急性间歇性破坏
C.慢性间歇性破坏
D.急性进行性破坏
E.慢性进行性破坏

考点:口腔五官科主治医师口腔内科学主治医师口腔内科学常识(一)
题型:单项选择题

Mobile phones and the Internet have improved our life in many ways. However, along with improvements, they also brought a number of worrying problems.

Many car accidents are caused by mobile phones. You can use many new mobile phones to get on the Internet .This can be very convenient, but some drivers get on the Internet while driving. Driving needs all our attention. By looking at their mobile phones and not at the road, these insensitive(不专注的) drivers are a danger to us all.

Many of the dangers of the Internet are well known. Children who visit websites without their parents’ permission sometimes talk to older people they don’t know and put themselves in great danger. People with blogs(博客) sometimes post(张贴) embarrassing photographs of people they don’t know on their websites without permission. There are also people who use the Internet to get personal information that we do not want them to have.

Mobile Phones and Internet Safety Tips

l If you need to use a mobile phone when you drive, use a “hand –free” phone.

l In difficult driving situation such as rain or snow, don’t use your phone at all.

l Do not make very important phone calls while driving. They take your attention off the road.

l Tell your children not to talk with anyone they do not know on the Internet.

l In an embarrassing situation, pay attention to people around you. People will be shy about taking your picture if they know you’re paying attention.

l Refuse to give out any personal information on the Internet.

小题1:Which of these dangers of mobile phones or the Internet is NOT mentioned in the passage?

A. You can have a car accident

B. Someone can post your photograph on the Internet

C. Someone you do not know can call you

小题2:Children should ______ on the Internet.

A. give out their important personal information

B. talk to older people they don’t know

C. ask for their parents’ permission sometimes to visit some websites

小题3:A “hand-free” mobile phone is probably a mobile phone that _____.

A. is free to use

B. can be used without your hands

C. can be used with only one hand

小题4:What advice is given in the passage to stop someone from taking an embarrassing picture of you?

A. Pay attention to the people around you

B. Don’t give out your personal information

C. Use a “hands-free” mobile phone

小题5:Which is the best title of the passage?

A. Internet Problems

B. Mobile Phone and Internet Dangerous

C. The Development of Mobile Phone and Internet

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一个小于200的自然数,它的每位数字都是奇数,并且它是两个两位数的乘积,那么这个自然数是______.

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三个奇数的和乘偶数,积是(  )
A.奇数B.偶数C.奇数或偶数
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连中“三元”

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简述锤锻模的失效形式。

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