牙瘤（） A.成牙组织的错构或发育畸形 B.良性、单囊或多囊、发生于颌骨内的牙源性肿

Do you still get free plastic bags from the supermarkets? Things have changed.

China has banned（禁止）free plastic bags in  shops and supermarkets，and people have to pay for using plastic bags. The rule started on June 1st. It came because our country tried to make less litter. Making super-thin plastic bags has also been banned.

The Chinese once used about 3,000,000,000 plastic shopping bags a day，and they have caused pollution of the environment. The bags have become a main cause of plastic pollution because they are easy to break and people throw them away here and there. So the Chinese people are encouraged to bring their own bags for shop ping.

What kind of shopping bag is the best to bring? Some students in Chongqing have a good idea. They make their own shopping bags. They use old clothes to make cloth bags，and send them to their parents as presents. They also ask their parents and friends to use cloth bags instead of plastic ones. They think it is their duty to protect the environment.

根据短文内容，选择最佳答案。

小题1: People in China have to         now.

A．throw plastic bags here and there

B．collect plastic bags in the street

C．pay for using plastic bags at shops and supermarkets

D．use free plastic bags at shops and supermarkets小题2: China made this rule because plastic bags were bad for the        .

A．environment

B．families

C．shops

D．supermarkets小题3: The Chinese people are encouraged to bring          for shopping.

A．no bags

B．free plastic bags

C．their own bags

D．super-thin plastic bags小题4:Some students in Chongqing        .

A．ask their parents to make cloth bags

B．make cloth bags themselves

C．pick up plastic bags everywhere

D．buy cloth bags for their parents小题5:What’s the main idea of this article?

A．Making super-thin plastic bags has been banned in China.

B．The bags have become a main cause of plastic pollution.

C．Some students in Chongqing begin to make their own shopping bags.

D．To protect the environment，free plastic bags have been banned in China.

早产儿视网膜病变的最主要原因是（）

A.早产与长期高氧暴露

B.早产与缺氧缺血

C.早产与感染

D.早产与低血糖症

E.早产与高碳酸血症

企业模型表示企业在经营管理中的职能，而企业职能范围是企业中的主要______。

下图为地球六地点大气上界太阳辐射年变化图。读图完成下列问题。

由太阳辐射纬度差异直接导致的自然现象或过程是（）

A.地表形态演变

B.植被呈纬度地带性分异

C.地壳物质循环

D.降水量沿海与陆地的差异

砌筑工程中下列做法（）往往是引起围护墙体、窗口与墙节点处渗水质量通病的原因

A.饰面层分层抹灰

B.门窗口与墙体的缝隙.没采用加有麻刀的砂浆压紧

C.门窗口的天棚设置滴水线

D.墙体灰缝大多通缝砌筑