Question

一个英语选择题(紧急)

In the past pesticides have been sprayed around areas_____termites visit, but according to Guo it is not an effective way of killing them and cause an environmental threat.
A which B where C that D why
麻烦解释一下答案啦

Answer 1

这是考从句来者，where是地点的引导词，意思是白蚁活动的地方。这句话的意思是：以前，杀虫剂经常用来喷洒在白蚁活动的四周。但根据Guo，这种方法不怎么有效而且会污染（威胁）到环境。

Answer 2

b