Australia's worst pests(害虫)are the rabbits, ______ by a settler who released 24 into the wild for sport hunting. In less than 100 years, the rabbits grow into the millions of ones, leaving large areas of land looking like the surface of the moon due to thousands of rabbit caves. The spread of the rabbits in Australia was the fastest of all animals in the world. The spread of the rabbits' _______in 1950 cut the number, but it was not until 1997 when the spread of another disease targeted the pests that the number was finally brought under control. Farm losses due to rabbits today still ______ a surprising total A $200 million (US $112 million)a year.

The European red foxes, also released for sport hunting, are growing and eating sheep flocks, costing farmers A $40 million(US $22. 4 million)a year. The State of Victoria ______ a A $10(US $5. 6)prize for each fox tail and has gathered 25,000 in a few months.

Foxes are one of the biggest threats to wildlife in Australia. Foxes kill thousands of lambs, birds and native wildlife.

Now the government is paying more attention to this problem. Scientists ______ that they should import some wild dogs, which are natural enemies of rabbits and foxes. But how to control their ______ is also a problem. Scientists say they will not take any big action until they are sure not to bring another ecological(生态的)problem.

1.A.discovered B.introduced C.shown D.killed

2.A.sadness B.struggle C.disease D.tiredness

3.A.kept B.remained C.left D.pushed

4.A.catches B.includes C.offers D.collects

5.A.suggest B.solve C.discover D.explain

6.A.letter B.name C.note D.number

David Smith,12,usually gets up at about 7:40 am. He goes to bed_______ and only gets about seven hours of sleep each night._______waking up in the morning isn't easy for him.“I often feel _______ in class,” David says.

Children from 5 to 12 years old _______at least ten hours of sleep each night.But scientists say that a lot of children don't get _______ sleep.Even some of them sleep _______ than eight hours every day.

What is keeping children _______at night?We made a survey in David's school.We collected the answers of all the students _______ this question.The answers show that the big stealer(偷窃者)is the _______.68% of the students in this school said they went online before________.Most boys and girls said they used the________ to chat(交谈)with friends.

Scientists say if a person has a good sleep,he or she will ________ well next day.If students sleep well at night,________ will do better in math and writing tests.

It's ________too late to change your sleeping habits.Go to bed early and keep doing that for a week.Then see ________ you feel.You will find you become different.

1.A.early B.soon C.again D.late

2.A.Because B.If C.So D.When

3.A.excited B.happy C.lucky D.tired

4.A.do B.decide C.need D.seem

5.A.popular B.healthy C.wonderful D.enough

6.A.more B.less C.best D.good

7.A.getting up B.cutting up C.waking up D.staying up

8.A.of B.with C.to D.by

9.A.computer B.dictionary C.magazine D.television

10.A.going home B.going to school C.going shopping D.going to bed

11.A.e?mail B.telephone C.bicycle D.Internet

12.A.dance B.learn C.sing D.jump

13.A.we B.he C.she D.they

14.A.always B.never C.often D.ever

15.A.what B.when C.how D.where

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