—Where ______ the Greens ______ their weekends?

—They often go to the park. [ ]

A. does; has

B. do; have

C. does; have

D. do; has

取氯化钠5g加水20ml溶解后，加稀醋酸2ml，使成25ml，依法检查含重金属不得超过百万分之二，应取标准铅（1ml相当于0.01mgPb）多少毫升（）

A.1ml

B.2ml

C.3ml

D.1.5ml

E.0.1ml