题目内容
（请给出正确答案）
Orbits decay due to ______.
A．the acceleration of the spacecraft
B．the crash with small amounts of air molecules
C．the invention and application of solar sails
D．the existence of air molecules
安装简答题APP，拍照搜题省时又省心！
更多“Orbits decay due to ______.A．t…”相关的问题
Mental decay due to aging is
A．common.
B．much more common than most people believe.
C．much less common than most people believe.
D．true of those over sixty.
Mental decay due to aging is ______.
A．common
B．much more common than most people believe
C．much less common than most people believe
D．true of those over sixty
An underwriter is liable for ______.
A.loss arising from the subject itself because of its inherent qualities
B.loss caused by the ordinary evaporation of liquids
C.loss caused by heavy weather
D.the natural decay of the vessel due to the passage of time
study of the twins into their 70's and 80's, their minds did not generally decline as was expected.
However, there was some decline in their psychomotor speed. This means that it took them longer to accomplish mental tasks than it used to. But when speed was not a factor, they lost very little intellectual ability over the years. (19)In general Dr. Jarvik's studies have shown that there is no decline in knowledge or reasoning ability. This is true not only with those in their 30's and 40's, but with those in their 60's and 70's as well. (20)In the cases where the older person's mind really seems to decay, it is not necessarily a sign of decay due to old age. Often it is simply a sign of a depressed emotional state.
How many pairs of twins did Dr. Jarvik's studies involved？
A．136.
B．60.
C．70.
D．80.
听力原文： Many of us believe that a person's mind becomes less active as he grows older. But this is not true, according to Dr. Lissy F. Javik, professor of psychiatry at the University of California, Los Angeles. Dr. Jarvik has studied the mental functioning of aging persons for several years. For example, one of her studies concerns 136 pairs of identical twins, who were first examined when they were already 60 years old. As Dr. Jarvik's continued the study of the twins into their 70s and 8Os, their minds did not generally decline as was expected.
However, there was some decline in their psychomotor speed. This means that it took them longer to accomplish mental tasks than it used to. But when speed was not a factor, they last very little intellectual ability over the years. In general, Dr. Jarvik's studies have shown that there is no decline in knowledge or reasoning ability. This is true not only into the 30s and 40s but also into 60s and 70s as well.
As for learning new things, and ability to remember, studies by Dr. Jarvik and others show that the old are equal to the young. It is true that older people themselves often complain that their memory is not as good as it once was. However, much of what we call "loss of memory" is not that at all. There usually was incomplete learning in the first place. For example, the older person perhaps had trouble hearing or poor vision, or inattention, or was trying to learn the new thing at a speed that was too fast.
In the cases where the older person's mind really seems to decay, it is not necessarily a sign of a decay due to old age or "senility". Often it is simply a sign of a depressed emotional state. The depression usually can be counteracted by counseling, therapy with a psychologist, or medications which fight depression.
(30)
A．It remains as active as ever.
B．It tends to be less active.
C．It loses the ability to reason.
D．It functions well in learning new things.
A.retransmitting
B.delaying
C.laying again
D.believing
A．as
B．which
C．so
D．that
The United States (has sent) several (spacecrafts) into orbits (around the earth) and has collected a lot of (information).
A．has sent
B．spacecrafts
C．around the earth
D．information
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
微信搜一搜
简答题
微信搜一搜
简答题
如搜索结果不匹配，请 
