优良的抽提操作标志是（）
A.要求有较高的芳烃回收率
B.要求贫溶剂含水量最低
C.要求芳烃纯度高
D.要求溶剂消耗量小
参考答案：A, C, D
—Cherry wants to know if you ________ a picnic tomorrow.
—Yes. But if it ________, we’ll visit the museum instead.
A. will have; rains
B. will have; will rain
C. have; rains
