补全对话。
A：Hello, Mike. ____
B：I often do housework on Sundays.
A：____
B：I can sweep the floor. ____
A：I can make the bed. ____
B：No, I can't wash the clothes.
A：____
B：No, I can't cook the meals.
A：Me, too.

A.   What do you do on Sunday? B.   Can you do the housework? C.   What about you? D.  Can you cook the meals? E.   What can you do?

$\cos \left(-\frac{13\pi }{3}\right)$＝(      )

（   ）对天气的影响很大，是天气日历中重要的记录数据。

对比下面两图可以看出，中国古代城市商业活动发生的重大变化是（    ）

唐代长安城      宋代东京城

如图中的免疫类型属于_____，病毒引起人体产生____．（    ）