单选题 Dry farming is a type of agriculture used in areas ______ less than 20 inches of rainfall.
A. there are B. where there is C. in which is D. which has

【正确答案】 B
【答案解析】[考点] 定语从句
[解析] 由前areas可知修饰地点，用where或in which，后面要有完整的句子，故选B。