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【单选题】
细胞凋亡的最主要特征是（）。A.
细胞以出芽方式形成凋亡小体
B.
DNA有控降解，凝胶电泳图谱成梯状
C.
细胞器溶解
D.
不引起发炎症状
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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 first magnitude star is（）.
A.
2.5 times as bright as a second magnitude star
B.
3 times as bright as a second magnitude star
C.
5 times as bright as a second magnitude star
D.
10 times as bright as a second magnitude star
【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
【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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