下列说法正确的是( ) A.大米是由子房发育成的 B.能榨出花生油的部分是由受精

题型:选择题

问题:

下列说法正确的是( )

A.大米是由子房发育成的

B.能榨出花生油的部分是由受精极核发育成的

C.去掉一朵桃花的花柱,这朵花仍能结出果实

D.豆芽的可食用部分是由受精卵发育成的

考点:传粉和受精开花与花的结构果实和种子的形成
题型:选择题

3.126×0.4的积有______位小数.

题型:选择题

下列药物中哪种可引起假性血尿()

A.磺胺药

B.吲哚美辛

C.利福平

D.环磷酰胺

E.甘露醇

题型:选择题

某工厂要制造一种特殊用途的钢铝罐,钢罐内表面要压接一层0.25毫米厚的铝膜,一时难住了焊接和锻压专家.后经技术人员的联合攻关解决了这一难题:他们先把铝膜紧贴到钢罐内表面,再往钢罐内灌满水,插入冷冻管使水结冰,然后铝膜与钢罐就压接在一起了.其原因是(  )

A.铝膜与钢罐间的水把它们冻牢了

B.结冰时铝膜与钢罐间的冰把它们粘牢了

C.水结冰时膨胀产生的巨大压力把它们压牢了

D.水结冰时放出的热量把它们焊牢了

题型:选择题

用所给词的适当形式填空。

1. I never feel ______(bore) when he is with me, because he's very funny.

2. I think the food my mother cooks is ______ (tasty) of all.

3. Could you tell me the ______ (high) of the building?

4. They decided ______(not go) to the park because they had too much work to do.

5. ______ (able) to sleep, I got up and made myself a drink.

6. — Didn't you hear the doorbell, dear?  

    —Sorry. I______(listen) to Pop music.

7. Some wild animals are in danger of the ______ (lose) of living areas.

8. There are more and more ______(nature) disasters in the world.

9. Many birds can live ______ (comfortable) in Zhalong all year round.

10. I'll watch the dolphin show alone if Tom ______ (be not) free tomorrow.

11. Tim and I are good friends, and we keep our secrets to ______(we).

12. —Would you like to see the maple (枫树) ______ (leaf) in Hongmei Park ?

      —I'd love to!

13. All of the students were excited at Yao Ming's ______ (arrive)

14. Do you have a great time ______(chat) with each other during lunchtime?

15. Our English teacher encourages us ______ (speak) English as much as possible.

题型:选择题

下列河流,哪对是没有联系的______

A.澜沧江—湄公河
B.怒江—萨尔温江
C.元江—红河
D.金沙江—湄南河

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