大米和面粉是我们生活中的主食．从来源看，他们是水稻和小麦种子

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问题选择题

大米和面粉是我们生活中的主食．从来源看，他们是水稻和小麦种子的哪一部分（　　）

A．子叶

B．胚

C．胚乳

D．子叶和胚

答案

首先我们知道吃的大米和面粉主要成分是淀粉，水稻和小麦为单子叶植物，单子叶植物种子的营养物质主要储存在胚乳中．蚕豆、花生等双子叶植物的种子的营养物质一般储存在子叶中．故C符合题意．

故选：C．

完形填空

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。（每小题1分，共5分）

W：Hi, John. 小题1:

M：Hi, Mary. I've been studying a lot for my final exam.

W：Well. 小题2:

M：Yes. My brother is coming for a visit this winter helically and we'd like to see some

of the country. 小题3:

W：小题4:

M：Camping? I have never done that. .

W：I think you'll like it. It's much cheaper than staying at a hotel. And being close to nature is a good way to forget about our school for a while.

M：小题5:We can go by bike until we find a nice place and just camp.

A．You should do that.

B．What a good idea.!

C．But traveling is so expensive.

D．Have you thought of camping?E．There are many beautiful sceneries.

F．I haven't seen you for a few weeks.

G．The term is almost over now.

填空题

热工电缆的设计应注意（）必须分开，所有二次回路测量电缆和控制电缆必须避开热源和有防火措施；进入计算机的信号电缆、补偿导线都应符合计算机使用规定的（）的屏蔽要求。