The number of students in our school ___ 9,000 and a number of them ___ from the city.  

A．are; are

B．is; are

C．is; is

D．are; is

在购买衣服时，你应该知道_________ 表示大号，_______ 表示小号，______ 表示中号。    [ ]

A. L; S; M    

B. L; M; S    

C. M; L; S    

D. S; M; L