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【简答题】
双受精是指一个精核与卵细胞受精结合为合子，一个精核与 受精结合发育成胚乳。
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举一反三
【单选题】My funny friend ______ me ______. [ ]
A.
makes; to laugh
B.
makes; laughing
C.
makes; laugh
【简答题】Excel2000 文件的扩展名为 。
【单选题】It _____ to me whether you go or not. [ ]
A.
makes no sense
B.
makes no difference
C.
makes sense
D.
makes difference
【单选题】The federal entity created by the Constitution is by far the dominant feature of the American governmental system. (1)_____ the system itself is in reality a mosaic, (2)_____ of thousands of smaller u...
A.
Therefore
B.
Eventually
C.
But
D.
Presumably
【单选题】Because the United States is not surrounded by many other nations, some Ameri-cans tend to ______ the rest of the world.
A.
ignore
B.
decline
C.
neglect
D.
overlook
【单选题】He always tells funny things to me and _________. [ ]
A.
makes me laughing
B.
makes me laugh
C.
makes me laughs
D.
makes me to laugh
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