腹腔镜下,胆囊切除术的适应证包括()。
A.急性胆囊炎并化脓
B.充填性胆囊结石
C.慢性结石性胆囊炎
D.慢性胆囊炎胆囊萎缩
E.急性胆囊炎并穿孔
参考答案:B, C, D
Today the forests are getting fewer and fewer. We must _____ down too many trees. [ ]
A. keep people from cutting
B. prevent people from cutting
C. stop people cutting
D. all the above
你认为人类基因组计划将对人类产生什么样的影响?