对于常数据成员，下面描述正确的是( )。A．常数据成员可以不_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

对于常数据成员，下面描述正确的是( )。

A．常数据成员可以不初始化，并且不能更新

B．常数据成员必须被初始化，并且不能更新

C．常数据成员可以不初始化，并且可以被更新

D．常数据成员必须被初始化，并且可以被更新

答案

参考答案：B

解析：常数据成员必须被初始化，并且不能更新。

选择题

比较下列句子中的“因”字，对其意义和用法判断正确的一项是

①秦军解，因大破之

②见功而与赏，因能而授官

③善战者因其势而利导之

④公等碌碌，所谓因人事者也

⑤汉兵因乘胜，遂尽虏之

⑥践华为城，因河为池

⑦因循守职，无所改作

⑧因陈桓子以请，乃许之

⑨因此怒，遣人追杀之

⑩因其无备，卒然击之

A．②与④相同，③与⑦不同

B．⑥与⑦不同，⑨与⑩相同

C．①与⑤相同，②与③相同

D．④与⑧不同，②与③不同

填空题

C) 根据短文内容，从下面方框中选择适当的单词或短语填空，使短文内容完整正确。

in order to, dangerous, pass away, turns off, answer

   People often talk on their mobile phones when they are driving. But talking or sending messages over a mobile phone can be as   1  as drunk driving. They can’t pay more attention to the road safety any more. Because of this, about 330,000 people are hurt and more than 2,000 people   2  every year.
Now, an American company invented a key by using Bluetooth technology   3  help people drive safely. With the key, a driver can’t talk or send messages when driving a car.
With Bluetooth technology, when the driver is driving, the phone will   4  all incoming calls and messages by itself with “I am driving now. I will call you later.” The only calls allowed out are to emergency services. When the driver   5  the car, he then can use the phone. This is all about saving lives and safer driving.