有关齿状线的解剖结构，下列错误的是（） A.齿线上静脉曲张形成内痔 B.齿线下静脉曲

下列没有运用比喻修辞手法的句子是[ ]

A．理想是闹钟，敲碎你的黄金梦。

B．这景色不见得很美，却是一幅秋日风情画。

C．我感到我和他们非常相似。

D．她牢牢地盯着月亮，就像财主盯着自己的金窖。

使用VC6打开考生文件夹下的工程test29_3。此工程包含一个test29_3.cpp，其中定义了二维坐标类Coordinate和三维坐标类ThreeDCoord，其中ThreeDCoord类由Coordinate类public派生，但两个类的定义并不完整。请按要求完成下列操作，将程序补充完整。
(1)定义类Coordinate的保护数据成员x和y，它们都是int型的数据，代表二维坐标的横纵坐标值。请在注释“//**1 **”之后添加适当的语句。
(2)根据类Coordinate定义后的成员函数Display的实现，补充该函数在类Coordinate定义体内的声明，Display为二维坐标类的虚函数。请在注释“//**2**。”之后添加适当的语句。
(3)完成二维坐标类Coordinate的构造函数，将参数a和b分别赋值给数据成员x和y。请在注释“//**3**”之后添加适当的语句。
(4)根据ThreeDCoord类构造函数的声明，补充ThreeDCoord构造函数的实现，参数a和b通过调用基类的构造函数来初始化基类的数据成员x和y，c赋值给数据成员2。请在注释“//**4**”之后添加适当的语句。
输出结果如下；
[1，2]
[3，4，5]
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tese9_3.cpp清单如下：
#include＜iostream.h＞
class Coordinate
protected:
//** 1 **
public:
Coordinate(int a=0, int b=0);
//** 2 **
;
Coordinate::Coordinate(int a, int b)

//** 3 **

void Coordinate::Display() const

cout ＜＜ ’[’ ＜＜ x ＜＜ ", "＜＜ y ＜＜ ’]’ ＜＜ end1;

class ThreeDCoord:public Coordinate

int z;
public:
ThreeDCoord(int a=0, int b=0, int c=0);
virtual void Display() const;
;
//** 4 **
void ThreeDCoord::Display() const

cout ＜＜ ’[’ ＜＜ x ＜＜ ", "＜＜ y ＜＜ ", "＜＜ z ＜＜ ’]’ ＜＜ end1;

void main ( )

Coordinate c(1, 2);
ThreeDCoord t(3, 4, 5);
c.Display ();
t.Display ();

分析各个项目的差额形成的原因与对总差额的影响国际收支总差额形成的原因，这种分析方法为（）

A.静态分析法

B.动态分析法

C.比较分析法

D.水平分析法

食管癌的大体病理分型，下列错误的是（）

A.缩窄型

B.蕈伞型

C.髓质型

D.梗阻型

E.溃疡型

Questions 81-90 are based on the following passage.

It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too.
The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte- literally, "fish killer. " It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding.
Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them.
Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation.
To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack.

Which of the following statements is true

A. Scientists have solved the mystery about the fish killer.
B. More studies need to be made about the fish killer.
C. It is proved that the algae are reducing fish populations.
D. Humans have already been affected by the toxin.