搜题请搜索小程序“爱下问搜题”
问题 选择题

只能表示一个化学反应的离子方程式是 [ ]

A.2Na+2H2O=2Na++2OH-+H2↑

B.CO32-+2H+=H2O+CO2↑

C.Ag++ Cl-=AgCl↓

D.CaCO3+2H+=Ca2++CO2↑+H2O

答案

答案：A

句型转换

请根据要求改写下列句子，每空一词。

1. We bought some books from the library last week. ( 改为一般疑问句)

    Did you___ ____ ___ _____ books from the library last week?

2. Millie is 1.6 metres tall. Kitty is also 1.6 metres tall. ( 将两句和并成一句)

    Millie is____ _____ tall_____ _____ Kitty.

3. I think this is a good way to keep healthy.( 改为否定句)

    I ___ ____think this___ ____ a good way to keep healthy.

4. It took me two hours to finish my homework yesterday. ( 改为同义句)

    I___________ two hours ___ ____ my homework yesterday.

5. Kate will return to China in a week. (对划线部分提问)

    ______ ______ will Kate return to China?
查看答案
填空题

学前儿童家庭创造教育中常见的游戏活动有角色游戏、（）、表演游戏、（）、音乐游戏、体育游戏。
查看答案