单选题The White House is open to the public _____.A on weekdays onlyB five days a weekC every other dayD on weekends only

When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web address mean? Every computer that hosts data on the Internet has a(71)numerical address. For example, the numerical address for the White House is 198.137.240.100. But since(72)people want to remember long strings of numbers, the(73)was developed. It is a critical part of the Internet's technical infrastructure, correlates a numerical address to a word. To(74)the White House website, you could type its numerical address into the address box of your web browser. But most people prefer to use "www. whitehouse. gov." In this case, the domain name is(75).

A．unique

B．isolated

C．similar

D．same

If the 10% rule is applied, ______.

［A］the best white high school students can get into colleges

［B］public universities can get excellent students

［C］students from poor rural families can go to colleges

［D］good minority students can get into public universities

The teacher divides the whole class into pairs. Every student works with his or her partner, and all the pairs work at the same time, it is sometimes call ________. With pairs of students speaking in turn in front of the class is called _______.

A.simultaneous pairwork

B.public or open pairwork“

C.public or open pairwork

D.simultaneous pairwork“

下面程序的结果是 ______。 #include＜iostream.h＞ class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout＜＜ "new file" ;} }; class C: public A{ public: void fun (){cout＜＜"open file"＜＜ " " } }; class D: public A{ public: void fun () {cout＜＜ "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=&c; p-＞fun (); p=&b; p-＞fun (); p=&d; p-＞fun(); }

A．new file open file save file

B．new file new file new file

C．编译出错

D．open file new file save file

The policeman came up to the lonely house with the door _______， _______ there for a while and then entered it. A. open； to stand B. opening； stood C. open； stood D. opened； standing

下面程序的运算结果是( )。 #include＜iostream＞ using namespace std; class A { public: virtual void fun()=0; }; class B:public A } public: void fun() {cout＜＜"new file"＜＜" ";} }; class C:public A { public： void fun() { cout＜＜"open file"＜＜" ";} }; void main() { A a, * p; B b;C c; p=&c; p-＞fun(); p=&b; }

A．new file open file

B．new file new file

C．编译出错

D．open file new file