学校家长会后，一同学的家长好心地对小鸥的母亲说：“这次综合检测中，小鸥与同学们的差距这么大，我怀疑他智力上有些障碍，应该到医院去查一查。”母亲听后心里很不是滋味，然而回到家里却对儿子说：“                           。”说这话时，她发现儿子黯淡的眼神一下子发亮，沮丧的脸也一下子舒展开来。

（1）a.文中表达不得体的语句是：                                      （1分）

b.可改换为：                                               （1分）

（2）联系上下文，补写出母亲说的话。（1分）

答：                                                                          

When you find the engine is hotter than normal, you should ______.

A．drive to a service station to get a cool engine

B．turn off your heater so as to cool down the engine

C．switch on the heater as soon as possible

D．try to make the engine boil over ______.