动物细胞、植物细胞和原生动物细胞应付低渗膨胀的机制有何不同？

在技术创新成果扩散的中介渠道中，大众传媒的特点是()。

A．可详细传播新技术的专业化信息

B．主要提供信息技术咨询服务

C．信息量大且覆盖面广

D．信息传播既经济又适时

人民法院对提起公诉的案件进行审查后，应根据案情作出何种处理决定( )

A．对于主要事实清楚，证据不足的案件，人民法院可以作出退回补充侦查的决定

B．对于主要事实不清，证据不足的案件，人民法院可以作出退回补充侦查的决定

C．如果被告人的行为不构成犯罪，或者犯罪情节轻微，不需要判处刑罚的，人民法院可以要求人民检察院撤回起诉

D．对于起诉书中有明确的指控犯罪事实并且附有相关的证据目录、证人名单和主要证据复印件或者照片的，应当决定开庭审判

如图所示，在质量为1 kg的容器内装有5 kg的水，容器底面积为100 cm²，容器放在水平桌面中间，桌面面积为0. 9 m² ，g取10 N／kg．求：

容器对桌面的压力为_______________N；

容器对桌面的压强为_______________Pa；

水对A点的压强为_________________Pa；

水对容器底的压强为_______________Pa．

People who are hit by lightning and survive often have long-term effects. These may include memory loss, sleep disorders, muscle pain and depression(郁闷).

Experts tell people to seek(寻找) the safety of a building or a hard-top vehicle any time they hear thunder, even if it is not raining. They say lightning can strike as far as sixteen kilometers from any rainfall. Lightning can travel sideways. And at least ten percent of lightning happens without any clouds overhead that you can see.

People who are outdoors should make sure they are not the tallest thing around. Bend(屈身) low to the ground, but do not lie down. And do not stand near a tree or any tall object. Get away from water and anything made of metal. A car is safe, but do not touch any metal inside.

Safety experts say people in buildings should stay away from anything with wires or pipes that lead to the outside. The National Weather Service says if you plan to disconnect any electronic equipment, do so before the storm arrives. Do not use a wired telephone. Do not use water. All these can carry electricity.

Some people think a person struck by lightning carries an electrical charge （电荷） afterward. Experts say this is not true. It is safe to begin emergency treatment.

Each year about four hundred people in the United States are struck by lightning. Last year forty four people died. The average(平均) is close to seventy. The National Weather Service says that is more than the number of people killed by severe storms.

小题1:According to the passage, which of the following is NOT true?

A．Lightning can happen even if there is no cloud.

B．Lightning won’t do harm to people’s health.

C．Lightning can travel sideways.

D．Lightning can strike very far.小题2:The underlined word “disconnect” (in Paragraph 4) refers to “_______”.

A．cut out

B．interrupt

C．disturb

D．cut off小题3:Which of the following mustn’t you do in order to seek lightning safety?

A．Hide in a building.

B．Sit in a car.

C．Bend low to the ground.

D．Lie under a tall tree.小题4:Which of the following is the main idea of the passage?

A．The latest information about lightning.

B．Some common knowledge about lightning safety.

C．How lightning comes into being.　　

D．Where we should hide in case of lightning.

儿童缺碘，可能最可能造成哪一种疾病？（）

A.口角炎

B.皮肤干裂

C.甲状腺肿大

D.牙龈出血