Which of the following statements correctly describes the alleviation of the effects of hypoxia at cabin altitudes about 10,000ft without the use of supplemental oxygen？ （）

According to Paragraph 6, which of the following is true of the effect of vaccines on different groups of people?

A．The vaccines will not be effective on unhealthy young adults

B．The elderly will be less likely to have major complications after vaccination.

C．The vaccines are effective on people of all ages if they are healthy.

D．Flu vaccines are of no use for old people or people with chronic diseases

According to Paragraph 6, which of the following is true of the effect of vaccines on different groups of people?

A．The vaccines will not be effective on unhealthy young adults

B．The elderly will be less likely to have major complications after vaccination.

C．The vaccines are effective on people of all ages if they are healthy.

D．Flu vaccines are of no use for old people or people with chronic diseases.

Which of the following statements is TRUE according to the passage?

A．96 percent of the earth's surface is covered by ice.

B．Over 10 million square miles of the earth's surface axe covered by ice now.

C．Almost all of the ice sheets covering the land and glaciers in the mountains have been hidden.

D．Most of the ice on the earth's surface is located in Antarctic and Greenland for the time being.

Which of the following statements is TRUE according to the passage?

A．96 percent of the earth's surface is covered by ice.

B．Over 10 million square miles of the earth's surface are covered by ice now.

C．Almost all of the ice sheets coveting the land and glaciers in the mountains have been hidden.

D．Most of the ice on the earth's surface is located in Antarctic and Greenland for the time being.

Which of the following statements is TRUE according to the passage?

A．96 percent of the earth's surface is covered by ice.

B．Over 10 million square miles of the earth's surface are covered by ice now.

C．Almost all of the ice sheets covering the land and glaciers in the mountains have been hidden.

D．Most of the ice on the earth's surface is located in Antarctic and Greenland for the time being.

Which of the following is an accurate statement about the pull of the sun on the earth?

A．It is about twice the pull of the moon.

B．It determines the time of high tide.

C．It determines the time of low tide.

D．It is about half the pull of the moon.

A、British made abundance of properties

B、no concerns from the French attacks

C、the establishment of British troops’ bonds

D、mistrust between British and the colonies

Which of the following is NOT one of the effects 0f multivitamins mentioned in the passage?

A．To reduce the rate of babies born too early．

B．To reduce the risk of low birth weight．

C．To reduce fetal deaths in pregnant women infected with HIV．

D．To increase the number of lymphocytes in mothers’b1ood．

Which of the following best describes the effect of Irving' s Presbyterian background on his life?

A．It fostered his love for the theater.

B．It developed his skill in business.

C．It prompted his interest in law.

D．It had almost no effect on his life.

According to the passage, which of the following statements about temperature gradients is true?

A．These temperature gradients tend in most cases to be impossible to describe mathematically.

B．The lower the contrast between the extremes of the gradient, the lower the resulting velocity of the jet stream.

C．Jet streams are responsible for most of the north-south transfer of heat between the equator and the poles.

D．The temperature gradient tends, on a non-negligible level, to augment the effects of the earth's rotation.

E．The gradient typically refers to differences in jet stream velocity at various longitudinal positions around the globe.