下列离子中不存在配位键的是() A.H3O+ B.OH- C.NH4+ D.[Z

题型:选择题

问题:

下列离子中不存在配位键的是 (  )

A.H3O+

B.OH-

C.NH4+

D.[Zn(NH3)4]2+

考点:化学键与化学反应中能量变化的关系
题型:选择题

Have you ever wanted to stop eating something sweet but you just couldn’t ? Is the first thing you do when you get home from school to look in the biscuit tin ? Can you eat a huge bar of chocolate all by yourself ? Can you say “no” to sweets at parties ? If you can’t ,  then there is a reason…perhaps you’re sugar addict (有瘾的人)! Does that sound funny ? Well, doctors say that people who eat sweets regularly can easily become addicted (成瘾的) to sugar .What’s more, most sugar addicts don’t even realize that they’re addicted! Sugar addiction is serious because it can really damage your health .Doctors say that we should eat food which is healthy such as fresh fruits and vegetables, and that we shouldn’t eat a lot of sugar ,fat or fast food .But sugar addicts can’t follow this advice.They know they must stop eating sweet food, but they can’t .So what can you do if you think you’re addicted to the taste of sugar ?Well, here is some advice:

Eat some fresh fruits when you really want something sweet to eat .

Cut down on sweet food slowly. Don’t try to stop eating it all at once.

You have to tell your parents, If they know, they will help you.

小题1:Who can become addicted to sugar easily?

A.People who eat sweet regularly.

B.People who eat lots of fat and fast food.

C.People who don’t have a balanced diet.

D.People who eat lots of fruits and vegetables.小题2:What does the underlined word “damage” mean?

A.be kind to

B.be good for

C.be harmful to

D.be sorry for小题3:What can we infer (推断) from the passage?

A.Fresh fruits are the best food for us.

B.We shouldn’t eat sugar to keep healthy.

C.Parents may help you give up bad eating habits.

D.It’s very necessary to stop eating sweet food at once.小题4:What’s the main idea of the passage ?

A.Some advice to stop eating sweet food.

B.The importance of have good eating habits.

C.The reasons why people become addicted to sugar.

D.Something about sugar addiction and how to give it up.

题型:选择题

不属于我国普通学校教育教学任务的是 ( )

A.引导学生掌握科学文化基础知识和基本技能

B.学生在课外独立自主进行学习能力的提高

C.培养学生的社会主义品德和审美情趣,奠定学生的科学世界观基础

D.发展学生的智力、体力和创造才能

题型:选择题

关于边缘性骨髓炎X线片表现,不恰当的为()。

A.可有局限性骨质破坏

B.骨密质外有骨质增生

C.大量死骨形成

D.可见弥漫性骨密度增高

E.可见骨膜反应

题型:选择题

关节脱位的病因中以哪项为多见()

A.持续劳损

B.肌肉强列收缩

C.直接暴力

D.间接暴力

E.感染

题型:选择题

晚唐体诗人以晚唐诗人()为师法对象。

A、杜牧

B、李商隐

C、贾岛

D、皮日休

E、姚合

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