发明水排的是( )
A:西汉的王景
B:东汉的杜诗
C:东汉的王景
D:西汉的杜诗
1731的分子减去一个数,分母加上同一个数,所得的新分数约分后是 13 .分子减去的这个数是( )
Clerk: ____ I help you?
Mary: Yes, please. I want a sweater.
Clerk: What ____ do you want?
Mary: Blue.
Clerk: Here you are.
Mary: How ____ is it?
Clerk: Nine dollars.
Mary: I'll ____ it. Thanks.
Clerk: You're ____.