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【单选题】
制作logo的时候,大多数存成矢量图,这是因为?A.
矢量图颜色多,做出来的标志漂亮
B.
矢量图不论放大或是缩小它的边缘都是平滑的,而且效果一样清晰
C.
矢量图的分辨率高,图像质量好
D.
矢量文件的兼容性好,可以在多个平台间使用,并且大多数软件都可以对它进行编辑
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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】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】According to the speaker, what is the possible er 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】The bald eagle_____ the United States.
A.
relates
B.
takes the place of
C.
represents
D.
stand for
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