10岁患儿右上肢烧伤，拟行扩创、取皮植皮术，可选用哪种全麻药（）
A．硫喷妥钠
B．羟丁酸钠
C．依托咪酯
D．氯胺酮
E．丙泊酚
参考答案：D
频数是指分配数列中各组的（）。
A.总体数
B.单位数
C.指标数
D.标志数
用括号里的词填空。
1. Jim is my friend. _____ is from Guilin. _____ mother is a doctor. (he, his)
2. —Whose dress is this?
—It is _____ . It is _____ dress. _____ likes it very much. (she, her, hers).
3. —Whose English books are these?
—They are _____. They are _____ English books. _____ like English very much. (we, our, ours)
4. Do _____ have any friends here? Yes, Cake and Jane are _____ good friends (they, their)
