哪项不是流行病学调查设计的必需内容A．明确调查目的和指标 B．确定研究对象、观察单位

To protect the environment, China has put a ban(禁令) on thin plastic bag (plastic bag thinner than 0.025 mm). From June 1, 2008, China stopped the production, sale and use of these plastic bags to the public.

Plastic bags can cause “white pollution”, because they can take 400-1,000 years to break down. They pollute the soil(土壤) and water. Plastic bags also cause a serious danger to animals. Animals often mistake plastic bags for food. Thousands of them die each year after eating plastic bags.

So what kind of bags will be the best to use when we are shopping? Recently some students made their own shopping bags. Most students used old clothes to make their bags. They painted pictures like the Olympic rings on them. But Li Mei had a more traditional way to make her hag. She weaved(编织) a bamboo(竹子) basket. It was not an easy job. With her grandfather’s help, Li Mei spent the whole afternoon making it.

What can we do? Refuse plastic bags and persuade(说服) people to use environmentally friendly(对环境无害的) shopping bags instead of plastic ones. Try to recycle the ones we have.

根据短文内容，按要求完成各题

小题1:Did Li Mei make her shopping bag by herself?

小题2:Why do plastic bags cause a serious danger to animals?

小题3:What kind of material did most students use to make their shopping bags?

小题4:When did China stop the production, sale and use of these plastic bags?

小题5:According to the passage, what should we do to protect the environment? (One example is OK.)

关于压强，下述说法正确的是（　　）

A．压强是一种力

B．压力越大，压强越大

C．受力面积越小时，压强越大

D．压强很大时，压力可能很小

Win16应用程序也同Win32应用程序一样，具有4GB的逻辑地址空间。不同的是，所有的Win16应用程序【 】同一个4GB的地址空间，并且以协作方式进行多任务处理。

巧妙运用模型、图片、幻灯、录音、电影等教学媒介来发挥教学作用，体现出了因材施教原则

宫廷学校