梨的腐烂是由什么引起的[ ]
A．水分过多
B．细菌的入侵
C．恶劣的空气
D．温度过高
答案：B
------Tell the kid to ________ the fireworks(烟花、爆竹)，please.
------Yes, you are right.
A．come up with
B．give away from
C．stay away from
D．run out of
气阀间隙过大、过小有什么影响？16V240ZJB型柴油机进、排气阀间隙各是多少？
