参与应激反应的主要激素是A．肾上腺素和去甲肾上腺素 B．醛固酮 C．抗利尿激素 D．

欠缴税款、滞纳金的纳税人或者其法定代表人需要出境的，税务机关可以责令其提供纳税担保。（）

下图是明朝时某船队在海上航行的路线图，该路线图反映的历史事件是

A．郑和下西洋

B．戚继光抗倭

C．郑成功收复台湾

D．雅克萨之战

既能使血管壁通透性升高，又对白细胞有趋化作用的炎症介质是（）

A.血小板激活因子

B.前列腺素

C.细胞因子

D.组胺

E.缓激肽

Nuclear power's danger to health, safety, and even life itself can be summed up in one word: radiation.

Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.

At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and if they are killed immediately. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They can grow into cancer. Sometimes this does not show up for many years.

This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated(辐射)and feel fine, then die for cancer five, ten, or twenty years later as a result. Or a child can be born weak as a result of radiation absorbed by its grandparents.

Radiation can hurt us. We must know the truth.

小题1:Which of the following statements is true?

A．Nuclear radiation is just like common radio waves.

B．Nuclear radiation can cause cancer to human beings.

C．Nuclear radiation can be detected by human senses.

D．Nuclear radiation can be safe to human beings if its level is low.小题2:How can nuclear radiation kill an animal?

A．By damaging its heart.

B．By killing a few cells.

C．By hitting any place in its body.

D．By killing many cells in important organs.小题3:If a human being is hit by nuclear radiation, he may __________.

A．die of cancer after many years

B．die immediately

C．have a child who may be born weak

D．all of the above

清朝的皇帝在修建皇陵时，工匠们为纪念祖师爷，在蓟县城内重修鲁班庙，以求祖师爷庇护。清朝的房屋建筑等级要求非常严格，如屋顶琉璃瓦的使用，黄色最尊，用于皇宫及孔庙；其次是绿色，用于王府及寺观；蓝色像天，用于天坛；其它红、黑、灰等杂色用于离宫别馆。鲁班庙是严格按照要求建造的，它使用的是哪种颜色琉璃瓦？