已知集合A={x||x-2|＜3，x∈R}，B={x|1x-a＞0，x∈R}，且

阅读理解。

     Growing kids need sleep, as do people of all ages. Indeed, research shows that health and safety both

suffer when we try to get by with too little shuteye. So it's fortunate that our bodies do such a good job

of waming us when it's time to hit the sack.

     Like humans, other animals also take time out to rest. You've probably seen a lion dozing at the zoo,

or maybe watched our dog snooze away lying in its bed. In fact, sleep is a necessity for every animal that's

ever been studied.

     How long animals sleep, though, varies widely. Elephants and giraffes sleep only about 2 to 4 hours a

day, while bats may nod off for up to 20 hours. Ducks sleep together, and the birds on the edge of the group

sleep with the outside eye open and half of their brain awake-probably to keep watch while the other half of

their brain snoozes. Some birds may even sleep while flying. The fact that all animals make time for sleeping,

even under very dangerous situations, suggests that sleep is very important. And indeed, some facts suggest

that sleep is important for leaming and forming permanent memories.

     But sleep may also be primarily a way for animals to save energy and stay out of harm. This may help

explain why meat-eating creatures sleep more than herbivores, which are animals that live only on plants.

Herbivores, like cows and zebras, need to spend more time searching for and grazing on food than meat eaters

do, such as lions and other big cats. So a big cat might be better off sleeping for a while after it eats, rather

than prowling around and risking injury.

     But that's just a guess. Scientists need to study other animals as well before they can fully understand the

benefits (好处) of sleep and know which benefits are most important for a particular species (物种).

     One thing is certain: enough sleep is important to health and learning. So give in when a strong wish to

sleep hits, and catch plenty of ZZZs.

1. The underlined phrase "to hit the sack" means ____.

A. to eat something

B. to drink something

C. to get up

D. to go to sleep

2. From the last paragraph, we can infer ____.

A. enough sleep may improve your learning in class

B. if you want to sleep in class, fall asleep immediately

C. you are easy to give in if you have plenty of sleep

D. if you have a strong wish to sleep, you are perhaps ill

3. The main idea of the passage is about ____. 

A. all people need sleep

B. how animals sleep in the open air

C. why animals need sleep

D. when animals feel sleepy

中国改革开放史是一部思想解放史。党的解放思想、实事求是的思想路线推动了中国特色社会主义不断前进。这说明[ ]

A．实践是由理论派生的

B．理论对实践具有决定作用

C．理论对实践具有指导作用

D．理论要和实践相结合

《规划环境影响评价条例》规定：有( )情形之一的，审查小组应当提出对环境影响报告=辟进行修改并重新审查的意见。

A．基础资料、数据失实的

B．评价方法选择不当的

C．对不良环境影响的分析、预测和评估不准确、不深入，需要进一步论证的

D．环境影响评价结论不明确、不合理或者错误的

E．预防或者减轻不良环境影响的对策和措施存在严重缺陷的

下列有关信用证的说法中，不正确的是( )。

A．银行要根据信用证相关法律规范的要求
B．银行必须依照客户的要求和指示办理
C．这是一个有条件承诺付款的书面文件
D．信用证专指国际信用证

少计提固定资产折旧会造成当期固定资产的净值减少。( )