A.15°
B.30°
C.45°
D.60°
答案:B
微生物生存所需的营养来自( )
A.植物
B.动物、人
C.自身合成
D.以上三种都有可能
How can you believe a person who has his promise again and again? [ ]
A. kept
B. broken
C. realized
D. made