皮皮学，免费搜题
登录
搜题
【简答题】
被子植物双受精后，由合子发育成( )，由受精的极核(中央细胞)发育成( )，由珠被发育成( )。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Immediately after their arrival in america, the american puritans became more preoccupied with business and profits, as they had to be in the grim struggle for survival.
【单选题】After the devastating earthquake, the ______ army was immediately called in to evacuate the weak and injured.
A.
regular
B.
normal
C.
formal
D.
conventional
【简答题】心室肌细胞具有兴奋性的前提是 Na + 通道处于( )
【单选题】He was (so) excited after hearing the news (and) he (could not) fall asleep (immediately).
A.
so
B.
and
C.
could not
D.
immediately
【单选题】According to Krom, the Egypt's old Kingdom fell ______.
A.
immediately after a period of drought
B.
immediately after a period of flood
C.
just before a drought struck
D.
just before a flood struck
【单选题】The chemistry teacher demanded that the laboratory report _________ immediately after the experiment was done.
A.
to be written
B.
would be written
C.
be written
D.
must be written
【简答题】贸易盈余与贸易赤字(trade surplus and trade deficit)
相关题目：