巴斯德认为,肉汤变酸是微生物引起的,并证明这些微生物来自空气,他成功的关键是[ ]
A.运气好
B.动脑设计了曲颈瓶
C.观察时认真
D.实验用具好看
答案:B
Eggs are sold by ________ dozen while the meat is charged by ________ weight.
A.the;the
B.the;/
C./;the
D./;/
选词填空:
① A 序 B 绪
心( ) 秩( ) 头( )
② A 既 B 即
( )使 ( )然 立( )
③ A 蓬 B 篷
( )隙 ( )勃 ( )乱
④ A 录 B 禄 C 碌
( )取 俸( ) 忙( )