The number of voluntary blood donors in Beijing in 1993 is ____.
A.more than 30,000 B.more than 28,000 C.more than 15,000 D.more than 14,000正确答案B
The number of voluntary blood donors in Beijing in 1993 is ____.
A.more than 30,000 B.more than 28,000 C.more than 15,000 D.more than 14,000正确答案B