- TOEFL чтение(понимание) тест №1

Лекция 45 мин.

Это окончание невероятной информации про .

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sentence best fit?
Choose the letter of the square that shows where the sentence should be added.
A
B
C
D

The chief health risk from inhaling radon or its daughter products is lung cancer. [A] Scientists have concluded that exposure to this carcinogen is the second leading cause of this disease in the United States. [B] Major scientific organizations believe it contributes to approximately 12 percent of the incidence in the United States alone. It is true that some research has cast doubt on the likelihood of residential radon accumulations contributing to cancer rates. [C] Other larger scale studies contradict the neutral findings. For example, a recent study of 68.000 underground miners who were exposed to high levels of radon shows that they are five times more likely to die of lung cancer than the general population. [D] Smokers, whose incidence of lung cancer is significantly higher than the nonsmoking population, are even more at risk if they are exposed to high levels of radon.

39. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

Write the letters of the answer choices in the spaces where they belong.
Refer to the full passage.

Radon can seep into a building, where its decay products can lead to health problems.

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Answer Choices

A) Although radon can enter a building in many different ways, it also escapes through cracks in the foundations.
B) Concentrations of the radon by-products attach themselves to particles in the air inside buildings and are breathed into the lungs.
C) People who smoke or work in mines are at greater risks of getting lung cancer that is related to alpha particles than those who work in buildings.
D) The by-product alpha particles are too heavy to disperse through the tissues, so they accumulate in the lungs where they kill or damage lung cells.
E) Radon does not cause lung cancer because it is chemically inert and therefore readily dissolves in the blood, where it eventually is expelled from the body.
F) Preventative measures can be taken to reduce the amount of exposure to radon in living spaces, but it is not possible to completely eliminate the gas from the atmosphere.

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Часть 1 TOEFL чтение(понимание) тест №1
Часть 2 - TOEFL чтение(понимание) тест №1

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- TOEFL чтение(понимание) тест №1

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