There was ____ rain last year. [ ]
A. much too
B. too much
C. many too
D. too many
答案:B
表达式x.operator+(y.operator++(0))还可以写成【 】。
当主根生长到一定长度时,就会在一定部位上侧向生出许多分枝,这些根称为()。
A、主根
B、侧根
C、不定根
D、定根