地籍调查方法以（）为单元。

标准误是指

A．所有个体值对均数的离散程度
B．某一样本均数对总体均数的离散程度
C．所有样本均数对总体均数的离散程度
D．某些样本对总体均数的离散程度
E．某个观察值对总体均数离散程度

阅读理解。

     Many people like animals, and often keep one or more of dogs and cats as pets(宠物). If you keep a dog or a cat

as a pet, you must look after it.

     A grown-up(成年的)dog needs two meals a day-not more. It can eat meat, fish, rice and some other things. Dogs

like bones(骨头), but you can't give them chicken bones. Remember to give them a lot of clean water.

     A dog should have a clean, dry box for sleeping(睡觉) in. Washing it once a week is good for its health. If it is ill,

take it to a vet(兽医). A healthy dog will bring you more pleasure.

     Be careful when you choose(挑选)a cat. A cat has two meals a day with some meat or fish. It drinks a little milk

every day. Sometimes you can give them vegetables to eat. Don't forget that they need clean water to drink.

     Take good care of your pets. They will be your good friends. Maybe they can give you some help when you are

in need.

Answer the questions.

1. What do dogs like eating?

__________________________________________________

2. Will pets be people's friends?

__________________________________________________

3.What kind of bones can't we give to the dogs?

__________________________________________________

4. What do cats like eating?

__________________________________________________

5. Why do we give cats and dogs two meals a day?

__________________________________________________

现实中，住宅物业购买的对象是最广大的居民群众，住宅物业管理项目的签订和广大居民的公共利益密切相关，选聘物业服务企业和签订物业服务合同的过程中，容易发生争议，客观上要求有更高的( )。

A．权威性

B．知名度

C．透明度

D．强制性

1938年，德国人（）在用慢中子轰击铀核时，首次发现了原子核的裂变现象，并放出新的中子。

A.哈恩

B.查德威克

C.卢瑟福

D.麦克斯韦

减少肝性昏迷患者肠道内有毒物质的产生，首选抗生素为

A．青霉素

B．氯霉素

C．新霉素

D．黄连素

E．磺胺