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【单选题】
天然蛋白质中不存在的氨基酸是A.
半胱氨酸
B.
脯氨酸
C.
丝氨酸
D.
蛋氨酸
E.
瓜氨酸
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【单选题】Zi means Ziwei Star and Ziwei Star is __________________________________.
A.
the North Star
B.
purple
C.
the South Star
D.
the surrounding area
【单选题】A double star is a star that（）.
A.
has a declination equal to twice that of the Sun
B.
comprises two stars that appear close together
C.
is twice as bright as a single star
D.
suddenly becomes much brighter and then fades
【单选题】If a star seems to be moving in a wavy line, we ______ it of being a double star.
A.
doubt
B.
believe
C.
guess
D.
suspect
【单选题】Sandra Clark is ______. [ ]
A.
running star
B.
a running star
C.
runner star
D.
a runner star
【简答题】简述发热的防御系统变化有哪些?
【简答题】硬盘工作时应特别注意避免
【单选题】Muller believed that ______.
A.
the star orbits around the sun
B.
the star is disturbed by the Oort Cloud
C.
the star is throwing comets into the Oort Cloud
D.
the star is responsible for extinction of life on the Earth
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