Are you carrying too much on your back at school?I'm sure lots of children of your age will say“Yes”.Not only the students in China have this problem, but children in the United States also have heavy school bags.

  Doctors are starting to worry that younger and younger students are having back and neck problems, as a result of school bags being too heavy for them.

  “It's hard for me to go upstairs with my bag, because it is so heavy,”said Rick Hammond, an 11-year-old student in the US.

  Rick is among the students who have common school bags with two straps(带子) to carry them.But many other students choose rolling(带滚轮的)bags.

  But even with rolling bags, getting upstairs and buses is still a problem for children.Many of them have hurt their backs and necks because of the heavy school bags.

  But how much is too much?Doctors say students should carry no more than 10% to 15% of their own body weight.

  Scott Bantch, a back doctor, said children under grade 4 should stay with 10%.But it is also important that older children don't stay with over 15%, because their bodies are still growing.“Children are losing their balance and falling down with their school bags,”he said.

  Parents and teachers are starting to tell children to only take home library books they will be reading that night.Some teachers are using pieces of paper or thin workbooks for students to take home.

  One of the best answer is, as some children said, to have no homework at all!

根据短文内容判断句子正(T)误(F)

(1)

The Chinese students' schoolbags are too heavy today.So do theirs in America.

(  )

(2)

Doctors are worrying about their patients.

(  )

(3)

One of the schoolbags is rolling.

(  )

(4)

Children feel it hard for them to go upstairs, because they are too young.

(  )

(5)

Some of the students think the best answer to this problem is that they should bring some books.

(  )

  Water pollution is caused by waste from factories and cities.Oceans are able to clean themselves, but certain seas, once they become dirty, are not able to do so.One example is the Mediterranean which lies between Europe and Africa.It has only one narrow entrance to the ocean in the west.One quarter of the shores(海岸)of the Mediterranean are polluted and are no longer safe for swimming, as a lot of diseases are present in the water.In most places it is not safe to eat the fish.

  Lakes also have the same problems.Lake Baikal in Asia was once the cleanest in the world, with over 700 different kinds of plants and animals living.Now, however, the water of this great lake, which is also the world's deepest(over 1,740 meters), has been dirtied by waste from a chemical factory.

  In 1989, an oil tanker hit a rock off the northwest coast of Alaska.35,000 tons of oil poured into the sea.The accident was one of the worst in history.More than 34,000 birds and 10,000 animals were killed.4,800 square kilometers of the ocean were polluted.

根据短文内容判断句子正(T)误(F)

(1)

The waste from factories and cities caused water pollution.

(  )

(2)

All the oceans and seas are able to clean themselves.

(  )

(3)

There are more than 700 different kinds of plants and animals living in Lake Baikal.

(  )

(4)

Lake Baikal is the deepest lake in the world.

(  )

(5)

The northwest coast of Alaska were polluted in 1989.

(  )
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