依据卢瑟福的原子行星模型理论,在原子中绕核高速旋转的是 A.核子 B.质子 C.

题型:选择题

问题:

依据卢瑟福的原子行星模型理论,在原子中绕核高速旋转的是

A.核子

B.质子

C.电子

D.中子

考点:电流的形成
题型:选择题

Last winter it was very cold and ________ was a lot of snow in the north.

A.it

B.this

C.that

D.there

题型:选择题

如果将草履虫和红细胞一同放在淡水中,那么[ ]

A.两者都死亡

B.草履虫存活,红细胞死亡

C.两者都存活

D.草履虫死亡,红细胞存活

题型:选择题

The weather is getting hotter. You are thirsty playing basketball or riding home from school. A cold drink may be just the thing. But be careful what you are drinking. Something that looks cool may not be good for your health. There are plenty of “energy drinks” on the market. Most of them have beautiful colors and cool names. The lists on them tell you they are helpful to your health. Sounds great!

But after a careful check you may find that most energy drinks have lots of caffeine(咖啡碱)in them. These drinks are especially aimed at young people, students, busy people and sports players. Makers sometimes say their drinks make you better at sports and can keep you awake. But be careful not to drink too much. Caffeine makes your heart beat fast. Because of this, the International Olympic Committee(IOC) has limited(限制) its use. Caffeine in most energy drinks is at least as strong as that in a cup of coffee or tea. Possible health dangers have something to do with energy drinks. Just one box of energy drink can make you nervous, have difficulty sleeping and can even cause heart problems. Scientists say that teenagers should be discouraged from taking drinks with a lot of caffeine in them.

小题1:Many people like drinking energy drinks because of the following EXCEPT that ______.

A.they have beautiful colors and cool names

B.they have lots of caffeine

C.they can keep them awake and better at sports

D.they are said to be helpful to health小题2:The main reason for people not to drink too much energy drinks is that they may cause ______.

A.heart problems

B.nervousness

C.sleeping difficulty

D.possible health dangers小题3:The underlined word “discouraged” can be replaced(替换) with ______.

A.encouraged

B.stopped

C.helped

D.disliked小题4:From the passage we can know that ______.

A.advertisements are important in getting people to buy energy drinks

B.energy drinks are helpful to teenagers’ study

C.sports players need to drink a lot of energy drinks

D.energy drinks are especially aimed at teenagers小题5:Which of the following can be the best title of the passage? ______

A.What’s the Use of Energy Drinks?

B.Who Can Drink Energy Drinks?

C.What’s That in Energy Drinks?

D.Why Can’t We Buy Energy Drinks?

题型:选择题

习 * * 7月5日在柏林同德国 * * 默克尔举行会谈,一致同意深化政治互信、加强务实合作、深化人文交流、密切多边配合,推动()发展。

A.新型大国关系

B.全方位战略伙伴关系

C.战略协作关系

D.全天候战略伙伴关系

题型:选择题

合理营养、均衡膳食的原则包括()。

A.品种多样

B.比例适当

C.饮食定量

D.调配得当

E.定点用餐

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