你想知道一周的第一天是星期几，你应该说（）

A、Who's pen is this

B、Whose pen is this

C、Is my pen

A、There are seven days in a week

B、It's Sunday

C、I have seven pencils

A、What do you do on Mondays

B、What day is it today

C、When is your brithday

A、It's under the table

B、Where is the pencil

C、Where are you from

A、The first day is Saturday

B、The next day is Saturday

C、The last day is Saturday

A、Is it hot in Shanghai

B、What's the weather like in Shanghai

C、What's the weather like today

是

否

是

否

是

否

是

否

是

否