人体呼出的二氧化碳气体的最终来源是 [ ]
A.细胞
B.肺泡
C.毛细血管
D.静脉
答案:A
Nowadays, few people form the habit of keeping a supply of candles in the house in case of power _____.[ ]
A. drop
B. lack
C. absence
D. failure
简述中 * * 党在领导思想与领导实践方面的主要贡献。