汽车的发动机工作时需要散热，散热器里装的是用来冷却发动机的液体，下表提供的液体中冷却效果最好的是
A、酒精
B、水
C、煤油
D、蓖麻油
答案：B
______improve his oral English, he took part in the summer course
A．So as to
B．In order to
C．So that
D．In order that
迎送外宾及重要旅客时通常用握手鞠躬微笑（）
A.亲吻
B.敬礼
C.打招呼
D.注目礼迎送
