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【多选题】
下面关于逆温类型及其形成原因的描述中,哪些是正确的?
A.
辐射逆温:由于夜间地面降温使地面附近大气冷却而造成的逆温
B.
平流逆温:冷暖空气相遇时,暖空气由于较轻而爬升至冷空气上部,在冷暖空气的过渡区产生的逆温
C.
下沉逆温:在高压控制的高空大气中,由于空气下沉压缩变扁,使得上部增暖大于下部而造成的逆温
D.
湍流逆温:由于地面附近空气在垂直方向上发生强烈的湍流混合,导致地面附近产生的逆温
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【单选题】The bald eagle ______ into the air and searched its prey with its penetrating eyes.
A.
staggered
B.
soared
C.
whirled
D.
perched
【单选题】计算机工作最重要的特征是
A.
高速度
B.
高精度
C.
存储程序和程序控制
D.
记忆力强
【单选题】The future survival of the bald eagle is still an important American ecological concern.
A.
migration
B.
population
C.
existence
D.
evolution
【单选题】听力原文: America's national symbol, the bald eagle, almost went extinct 20 years ago. But it has made a comeback. In fact, the U. S. Fish and Wildlife Service is considering the possibility of taking it ...
A.
It limited their supply of food.
B.
It made their eggshells to fragile.
C.
It destroyed many of their nests.
D.
It killed man baby bald eagles.
【单选题】______ is the national symbol of Australia
A.
Maple
B.
Lion
C.
Emu
D.
Bald eagle
【单选题】According to the speaker, what is the possible danger facing bald eagle?
A.
Pollution of the environment.
B.
Over-killing by hunters.
C.
Destruction of their natural homes.
D.
A new generation of pest killers.
【单选题】在家兔动脉血压实验中,夹闭一侧颈总动脉引起全身动脉血压升高,其主要原因是
A.
血管容积减少,相对血容量增多
B.
颈动脉窦受到牵拉刺激
C.
颈动脉窦压力降低
D.
颈动脉体受到牵拉刺激
E.
颈动脉体压力降低
【单选题】The future ______ of the bald eagle is still an important American ecological concern.
A.
birth
B.
evolution
C.
migration
D.
survival
【单选题】在家免动脉血压实验中,央闭一侧颈总动脉引起全身动脉血压升高,其主要原因是
A.
血管容积减少,相对血容量增多
B.
颈动脉窦受到牵拉刺激
C.
颈动脉体受到牵拉刺激
D.
颈动脉窦压力降低
E.
颈动脉体压力降低
【单选题】The bald eagle_____ the United States.
A.
relates
B.
takes the place of
C.
represents
D.
stand for
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