With an increasing adoption of GM crops, the use of pest­control chemicals has been greatly reduced.In fact，while  not  necessarily  related  to  food­related  biotechnology，some GM plants have been developed to take care of heavy metal pollution in some polluted soil.  Finally，biotechnology can allow people  to receive vaccines  (疫苗)that are  difficult to distribute.By putting vaccines  into food  products，organizations can more easily transport them to people in need.

1.We can learn from the text that ________.

A.GM crops benefit the environment

B.farmers fail to grow a lot of plants

C.insect pests do less harm to the soil

D.more greenhouse gas is sent into the air

2.What can we infer from the example of the sweet potato?

A.Kenya will have the most advanced technology in the future.

B.Crops can be modified to grow in worse natural environment.

C.Potatoes grown in wet areas can resist different kinds of insects.

D.The adoption of GM potatoes may do harm to the farmers' health.

3.Which of the following can be concluded from the text?

A.New challenges in world farming have been caused.

B.Certain kinds of GM plants can be used as medicine.

C.Biotechnology will be used in more and more fields.

D.It is difficult to transport GM products in some areas.

4.According to the text，GM crops in poor countries ________.

A.need further research on chemical resistance

B.cost more time and money on farm management

C.suffer fewer natural disasters during the growth

D.offer good economic benefits to farmers

5.The text mainly talks about ________.

A.benefits of genetically modified food crops

B.distribution of some GM crops in the world

C.progress made in potato growth in Africa

D.the use of biotechnology in medical science

Ⅳ.阅读填空

(2013•浏阳一中高二上期中)

Directions: Read the following passage.Complete the diagram by using the information for the passage.Write NO MORE THAN 3 WORDS for each answer.

Sharks have lived in the oceans for over 450 million years, long before dinosaurs appears .There are now about 360 species of sharks, whose size ，behavior ，and other characteristics differ widely.

Sharks range in size from the 6­inch­long dwarf­dog shark to 60­foot­long whale shark—the world's biggest fish.The whale sharks, like two other large shark species—the basking shark and the mega mouth shark-are harmless to people because they feed on plants and small aquatic(水生的)animal.

Every year，we catch and kill over 100 million sharks, mostly for food and for their fins.Dried shark fins are used to make shark fin soup, which sells for as much as $50 a bowl in fine Hong Kong restaurants.Others sharks are killed for sport and out of fear.Sharks are volunterable (脆弱)to overfishing because it takes most species 10 to 15 years to begin reproducing and they produce only a few offspring.

While sharks are seen as people–eating monsters, they save human lives.In addition to providing people with food, they are helping us in cancer.They are among the few animals in the world that almost never get cancer.A research shows that chemicals extracted (提取)from shark cartiage(肋骨)have killed cancerous tumors in laboratory animals.Their highly effective immune system also allows wounds to heal quickly without becoming infected.

Sharks are needed in the world's ocean ecosystems.Although they don't need us，we need them.We are much dangerous to sharks than they are to us.For every shark that bites a person, we kill one million sharks.

Sharks

Origin of sharks Sharks appeared 1.________ago，long before dinosaurs.

2.________ Dwarf­dog sharks are 3.________.

Whale sharks are 60 feet long.

4.________of being caught and killed For food.

For sport.

5.________.

6.________ Sharks help us to 7.________.

Sharks can heal quickly when

8.________.

9.________ Humans should protect sharks for the world's ocean ecosystems，

Because we are 10.________sharks.

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