问题 单项选择题

新药Ⅲ期临床试验的最低病例数(试验组)是

A.18~24例

B.20~30例

C.100例

D.300例

E.2000例

答案

参考答案:D

解析:新药Ⅲ期临床试验是进一步的验证性试验,例数比Ⅱ期更多,一般最低要求300例。

阅读理解

阅读理解。

     Can you imagine a world without the Internet? It's amazing to think about it.

     Now, China has more than 68 million Internet users, according to the China Internet Network Information

Centre. This is the second highest number of users in the world after the United States. Today, 44% of

Chinese "netizens (网民)" are teenagers."They spend about 13 hours every week online," said Qian Hulin, an

Internet expert. 

     The main reasons why teenagers surf the Web are to search for information, to communicate with others

and to have fun. On the Internet, teenagers can find out almost anything. And surfing the Web can help

students with their homework and widen their knowledge.

     Li Dong, a teacher at No. 41 Middle School in Shijiazhuang, likes her students to use the Internet. "When

we talk in class, students who surf the Net usually know more background information than the others," she

said.

     In addition, people can use the Internet to write letters or stories and send emails. Many teens keep in

touch with their friends online. It is cheaper than phoning somebody far away and also much quicker.

1. Which country has the most Internet user?

A. China

B. England

C. America

D. Japan

2. How many hours do teenagers spend on the Internet every week?

A. About 44 hours

B. About 13 hours

C. About 41 hours

D. About 10 hours

3. Why do teenagers surf the Web?

A. To get some money

B. To search for information

C. To have fun

D. Both B and C

4. Why does the teacher from Shijiazhuang like her students to use the Internet?

A. Because she wants to play computer games with them.

B. Because she wants to have a talk with them.

C. Because she wants to know what they do at home.

D. Because she wants to let them know more background information.

5. Which way is the cheapest and quickest to tell something to your friend who is far away?

A. Posting a letter.

B. Sending an e-mail.

C. Making a telephone call.

D. Going to visit your friend.

问答题

使用VC6打开考生文件夹下的工程test4_3。此工程包含一个源程序文件test4_3.cpp,其对一个学校的教师和考生情况进行了描述。由于教师和考生之间有相同的信息,如姓名、年龄等,所以可抽象出一个基类person,考生类student和教师类teacher作为person类的派生类。请按要求完成下列操作,将程序中的类定义补充完整。
(1)定义基类person的私有数据成员name和age,分别用于表示姓名和年龄,name为字符指针,age为血型的数据。请在注释“//**1**”之后添加适当的语句。
(2)完成基类person的重载构造函数person(char *n,int a)的定义,把数据成员name,age分别初始化为参数n,a的值,请在注释“//**2**”之后添加适当的语句。
(3)根据主函数main中对s1的声明,定义派生类student的构造函数。在注释“//**3**”之后添加适当的语句。
(4)完成派生类teacher成员函数void setinf(ehar *n,int a,char *d,char *1)的定义,其功能为记录教师的姓名、年龄、院,系与职称信息。请在注释“//**4**”之后添加适当的语句。
输出结果如下:
刘雷(45)destructor
蒋军(23)destructor
注意:除在指定位置添加语句之外,请不要改动程序中的其他内容。
源程序文件test4_3.cpp清单如下:
#include<iostream.h>
class person

//**1**
public:
person()
person(char *n,int a)

//**2**

void setname(char *n)name=n;)
void setage(int a)age=a;
~person()cout<<name<<"("<<age<<")destructor"<<endl;)
;
class student:public person

char *department;
int code;
public:
//**3**

department=d;
code=c;

;
class teacher:public person

char *department;
char *level;
public:
teacher()
void setinf(char *n,int a,char *d,char *1)

//**4**
department=d;
level=1;

;
void main()

student s1("蒋军",23,"计算机学院",2);
teacher t1;
t1.setinf("刘雷",45,"计算机学院","教授");