Lily ____ likes documeniaries. [ ]
A. also
B. too
C. either
D. doesn't
答案：A
甲和乙两数的和为40，乙和丙两数的和为30，甲和丙两数的和为50，求甲、乙、丙三数的平均数是______．
属于局部麻醉药的是
A．盐酸利多卡因B．麻醉乙醚C．氟烷D．盐酸氯胺酮E．苯巴比妥
