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The earth moves around the sun, and the moon moves around the earth. When our part of the
earth turns to the sun, it is day. When our part of the earth turns away from the sun, 1_____The
sun is much bigger than the moon. But sometimes the moon looks bigger than the sun, 2_____
The sun is very bright.3_____The moon looks quite bright, too.4_____ The moon looks much
bigger and brighter than the stars. 5_____ They look smaller than the moon because they are
much farther away from us.
A. But actually the stars are much bigger and brighter than the moon.
B. it is night.
C. It gives a very strong light.
D. because it's much nearer to the earth.
E. But it doesn't give any light at all.
是烯烃与H2加成后的产物，则该烯烃的结构简式可能有