单项选择题
A．it is difficult to cool the engine B．the driver can only open the hood on a hot summer day C．the driver has to be very patient D．it takes a long time to open the hood in summer
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 ______.
A．they don't like human sciences B．they are afraid they might meet with unfair judgment in these areas C．there is a wide difference between Asian and Western cultures D．they know little about American cultures and Western cultures