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【多选题】
双受精后,关于双子叶植物胚的发育过程,正确的说法是()。A.
受精卵发育形成胚
B.
受精卵第一次分裂为不等分裂
C.
基细胞发育形成胚体
D.
顶细胞发育形成胚体
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举一反三
【单选题】good manners to say “Sorry” when you knock into someone but no need to say it again and again .
A.
There are ; there is
B.
It is ; there is
C.
There is ; it is
D.
It is ; it is
【单选题】－You must say sorry to Mary, Jack. －Why ________ I say sorry to her? It’s her who hurt me first.
A.
should
B.
would
C.
could
D.
might
【简答题】在Windows中，要改变窗口的位置，可以用鼠标拖动窗口的（ ）。
【单选题】--I'm sorry, but I don't quite follow you. Did you say you wanted to return on September 20? --Sorry, I__________myself clear. We want to return on October 20.
A.
hadn't made
B.
wouldn't make
C.
don't make
D.
haven't made
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