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【简答题】
请据图回答： （1）蚕豆种子的胚是由图中序号______ 组成．胚是由______发育成的 （2）菜豆种子和玉米种子结构上的相同点是______． （3）向玉米种子剖面上滴碘液，变成蓝色部分是[______]______． （4）我们食用的豆油来自图中的[______]______． （5）农民在适宜季节播种时，为使苗全苗壮，从种子自身条件来看应采取的措施是______．
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【简答题】想一想,按照老规矩,北京人是什么过春节的?给你印象最深的是什么?
【单选题】听力原文：W: It looks like rain. Here take my raincoat. M: Thanks all the same, but I have an umbrella in my office. Q: Why dose the man not take the raincoat? (4)
A.
He doesn't think it will rain.
B.
He doesn't borrow things.
C.
He has an umbrella.
D.
He also has a raincoat.
【单选题】It looks like rain. You______go out and watch TV at home.
A.
are better not to
B.
had better not
C.
wouldn't better to
D.
had not better
【简答题】— Shall I____the raincoat? —No hurry.Leave it _____it is.It looks like rain. A．put on;there B．put on;where C．put away;in the place D．put away;where
【简答题】请每位同学认真听长对话2音频,填写图中长对话空格处。
【简答题】题3．2．5图所示各电路在换路前都处于稳态，试求换路后电流i的初始值i(0十)和稳态值i(0_)。
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