儿童掌握各种守恒有一定的顺序，最先掌握的是（）；最后掌握：体积守恒。
参考答案：数目守恒
用所给单词的适当形式填空。
1. I want _________ (join) the art club.
2. Mr Wang helps kids with _________ (swim).
3. —Can you sing? —No, I _________ (can).
4. Can you _________ (speak) English?
5. Can you play it _________ (good)?
6. Are you a _________ (music)?
7. My sister likes singing and _________ (want) to join the music club.
8. _________ (they) rock band will show in our school.
9. My father often _________ (help) me with computer.
10. What club _________ (do) Alan want to join?
A．
B．
C．
D．
