What does the underlined “this” in Paragraph 4 refer to、

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• 1Which of the following is most affected by experience according the passage、

  A.Eating habits.

  B.Eye-sight.

  C.Pain resistance.

  D.Marriage patterns.

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• 2According to the passage, __________.

  A.one in 70 twins are genetically identical

  B.non-identical twins are usually not of the same sex

  C.twins separated at birth behave exactly the same

  D.identical twins are genetically the same

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• 3Why are scientists studying twins、

  A.To find out how many twins are born every year.

  B.To discover what shapes us as individuals.

  C.To compare differences between twins.

  D.To study brother-and-sister relationships.

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• 4What is the main idea of the first paragraph、

  A.We cannot easily change our physical appearance.

  B.How we turn out depends on our parents’ genes.

  C.Everyone has a physical double somewhere in the worl

  D.D.Both our genes and our experiences make us who we ar

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• 5According to the passage, what is the main reason that the cat works miracle、

  A.He is able to inspire others.

  B.Patients feel sympathy for him.

  C.People are amused by his appearance.

  D.He has the ability to cure the ill.

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• 6The underlined word ”scarce” in paragraph 1 most probably means_________.

  A.valuable

  B.rare

  C.infrequent

  D.missing

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• 7What is putting pressure on the local supply of clean water、

  A.Dust from the road is making the water dirtier.

  B.There are too many taps accessing the water.

  C.The population of the area is growing fast.

  D.The coming summer will dry up rivers and lakes.

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• 8What is the most serious limitation on Laos’ economic growth、

  A.The lack of local skilled workers.

  B.A poor transportation system.

  C.Too much foreign ai

  D.D.Too many foreign workers.

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• 9According to the passage, which of the following is NOT a reason for Laos to be hopeful、

  A.There are no fast-food restaurants in the country.

  B.Laos has a variety of tourist attractions.

  C.Information on the Internet is freely accessible.

  D.The government owns all local media.

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• 10What is the best title for the passage、

  A.Laos: small steps forward.

  B.Laos: slow-developing nations

  C.Laos: least-developed land

  D.Laos: landlocked country

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