第33题: [单项选择] {$mediaurl}What is the discussion mainly about A. General features used to define what deserts are. B. Characteristics shared by all types of deserts. C. The effects of deserts on the global climate. D. Different factors that lead to the formation of a desert. 参考答案:D 答案解析:[解析] 6-11 [Professor (male)] Q6 So today I thought we’d focus our discussion on deserts--diffe