如果2a-3是多项式4a2+ma-9的一个因式，则m的值是[ ]
A.0
B.6
C.12
D.-12
答案：A
－ Have you finished your project, Cathy?
－ Not yet. My computer _____. [ ]
A. is still being fixed
B. is not fixing
C. has already been fixed
D. has not fixed
为什么红色的叶子也能进行光合作用？
