Question

---Look, Maria! The newspaper says the world has a population of 6.8 billion.
----Yes. And it is increasing___________ 80 million every year.
A. to             B. in          C. by

Answer 1

C

解析试题分析：句意:——看，玛利亚！报纸上说世界上有68亿人口。——是的。每年增加八千万人口。Increase by增加……。根据语意故选C。
考点：考查介词。