问题补充：
It’s believed 40% of stars, like the sun, may have planets that orbit them.
A. as many as
B. as much as
C. many more
D. much more
答案：
(答案→)A. as many as
B. as much as
C. many more
D. much more
解析：as much as与…差不多；多达…(表示“量”上的比较)，修饰不可数名词，故排除 B；as many as多达…(表示“数目”上的比较)，修饰可数名词；many more后接一个名词一定是个复数可数名词。much more后接一个名词，这个名词一定是个不可数名词。这两者可指“更多”，故排除C和D。
