4. Do you believe (火星上有生命) ？

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4. 我看不出他們的區(qū)別。 (spot)

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1. What it yas to become was uncertain until between 4. 5 and 3. 8 billion years ago when the dust settled into a solid globe. (P25)

[分析]

① 本句是一個(gè)主從復(fù)合句。

② 主句是 What it was to become was uncertain until between 4. 5 and 3. 8 billion years ago,when 引導(dǎo) 從句。

③ 主句中包含一個(gè)由what引導(dǎo)的主語從句，what在從句中作 。

[句意]隨后它會(huì)變成什么沒人能知道，直到38-45億年 前，這團(tuán)塵埃才慢慢地形成一個(gè)固體的球狀物。

[仿寫]杰克打算做什么我不知道，直到第二天早上，他 才告訴了我他的計(jì)劃。

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3. If you m 7 by 15 you get 105.

4. Ois a colourless gas that forms a large

part of the air on the earth and which is needed by people,animals and plants to live.

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      Bart Weetjens has always loved rats. As a kid in the Netherlands,he raised them as pets. He was amazed by their intelligence and their great sense of smell. Today,Weetjens is using rats for a good cause identifying (確認(rèn)) a disease called tuberculosis (肺結(jié)核) , or T B. in Africa. Through his organization,called APOPO,Weetjens trains rats to find TB by using their noses. The rats that APOPO trains are called “HeroRats."

    Tuberculosis affects millions of people every year. Usually,if a patient is thought to have the disease,doctors run lab tests to identify it. A doctor takes a sample of mucus (枯液樣本) from the patient's lungs. Then lab workers examine the sample to see whether the person has the disease.

   But Tanzania and Mozambique,two African countries with high rates of T   B. are short of medical workers and labs. As a result,it can take a long time to diagnose (診斷) the disease. In the meantime,more people can get sick as the disease spreads.

     In 2002,APOPO began training rats to smell TB in mucus samples. It trains African giant rats,which are friendly and hardworking. To detect T B. the rats smell mucus samples through holes in a glass cage. When a trained rat finds a sample with T B. it pauses over the hole.

     HeroRats train for months before they start working. To teach a rat to identify T B. a trainer presents the rat with several mucus samples. The trainer already knows which are samples with TB.

     If the rat spends a long time smelling a diseased sample,the trainer gives the .rat a treat. This teaches the rat that finding TB will earn it tasty food.

      “The rats learn quickly,since they love food/' says Beyene,an APOPO scientist. The rats are faster than lab workers. In 10 minutes,they can screen as many samples as a person could examine in two days. At centers in Tanzania and Mozambique,HeroRats have found thousands of TB cases that labs missed. Thanks to them,sick people can now be treated earlier than ever before. In the future,APOPO hopes to train its rats to identify other diseases too.

1. What can we learn about Bart Weetjens?

   A. He works as a rat trainer.

   B. He has studied TB all his life.

   C. He has a very sensitive nose.

   D. He has a deep interest in rats.

2. What' s the main problem with the diagnosis of TB in Tanzania and Mozambique?

   A. It is very slow.

   B. It is full of mistakes.

   C. It brings pain to people.

   D. It wastes a lot of money.

3. During the training,the rats.

   A. have better food than usual

   B. behave intelligently

   C. work long hours

   D. get bored easily

4. HeroRats’ jobs .

   A. seem dangerous

   B. need improving

   C. prevent TB in Africa

   D. are helping save lives

5. What would be the best title for the text?

   A. Noses at work

   B. Lovely HeroRats

   C. Man with a big heart

   D. TB — a deadly disease

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3. Smoking can be . (harm) to your health.

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3. Anything that is dropped falls towards the centre of the earth because of the pull of g .

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4. John will arrive is unknown. Maybe two hours later.

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.

4. When I woke up this morning the  ground was covered with(霜).

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