题干
.
—___________ is the population of the United States?
—I don’t know exactly, but I’m sure that it has __________ population than China.
—___________ is the population of the United States?
—I don’t know exactly, but I’m sure that it has __________ population than China.
A：How much; much le
B：How many; fewer
C：What; much le
D：What; a much smaller
答案(点此获取答案解析）
D
，定义运算
，其中
是常数，等式右边的运算是通常的加法和乘法运算。已知
，并且有一个非零常数
，使得对任意实数
， 都有
，则