乐清市，是浙江省辖县级市，由地级温州市代管。读“1978年和2010年乐清市产业结构变化图”，完成下列各题。

A：Dad!Can I go o____now?

B：No,it's too late．

A：Well, can I p____my violin?

B：No，you can't．You must be q____.Your sister is doing(正在做)her homework．

A：What can I do then?

B：You can help your mom dothe d____．

A：Oh,no! I don't like doing that．

B：What do you like doing?

A：I like going out and playing with my friends．

B：Jason,you can't go out after 8：00p.m．Don't you know the r____?

A：I know! I know!

使小狗建立“铃声﹣﹣唾液分泌”条件反射的适当方法是（    ）

生活在北极的狐与生活在非洲沙漠中的狐相比，耳朵要小得多．下列对这种现象的解释哪种是正确的（    ）

“口号”在一定程度上折射和传递这历史信息，下列属于五四运动的口号是（    ）