---What the population of China ?-China has a population of 1.3 .A. is billionsB. are

问题补充：

---What the population of China ?

---China has a population of 1.3 .

A. is, billions

B. are; billions

C. is; billion

D. are; billion

答案：

A. is, billions

B. are; billions

(答案→)C. is; billion

D. are; billion

解析：population是集体性名词，所以它的谓语要用单数。