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问题 单项选择题

使用下列哪个选项可以调用基类中的特定构造方法

A．final

B．this

C．super

D．static

答案

参考答案：C

解析：super用来引用当前对象的父类。当子类隐藏了父类的变量，并重 写了父类的方法后，又要使用父类变量或父类被重写的方法时，可通过super来实现对父 类变量的访问和对父类方法的调用。this用来引用当前的对象。

填空题
阅读下面的短文,从所给单词中选出适当的单词,并且用其正确的语言形式填在标有题号的空白处,使句意通顺完整。（每空一词,每个单词使用一次）
them   people   many   like    have  do    around    save   
cost   for     when   spend   also     popular    buy  
Cars are very   小题1:   , but too    小题2:   cars make much pollution (污染). Now the idea of “car sharing”(拼车) is popular     小题3:    the world. That’s to say, more     小题4:    are sharing the use of the car. Not everyone   小题5:   a car. As we know, so many families have cars today, most of     小题6:   don’t use it everyday. Some cars  小题7:  most of their time staying in garages(车库). We don’t use them, but parking(停车) and other things can    小题8:   us a lot. That needs a lot of money.
To 小题9:  money, some people thought of the idea of “car sharing”. If we share a car, we can only pay for it  小题10:   we use it. Now more and more people would  小题11:  to do car sharing. In Switzerland(瑞士), about 40,000 people are  小题12:  this thing. Japan is  小题13:  trying to make “car sharing” popular around the country.
“Car sharing” is a new idea in transportation(交通). It is also very easy  小题14:  us to go everywhere we want without   小题15: a car.
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单项选择题

将吸进柴油机气缸内的新鲜空气进行压缩以获得着火所必要的（）。

A、温度

B、空气

C、能量

D、氧气
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