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问题 选择题

有报道说：“目前世界上有近20亿人患有缺铁性贫血”，这里的“铁”是指（　　）

A．铁单质

B．铁原子

C．铁元素

D．铁锈

答案

人体中的铁元素是以无机盐的形式存在的，这里的铁是指铁元素，不是铁原子和铁单质，更没有铁分子．

故选C．

单项选择题

Which of the following is NOT true about unwanted e-mail

A．It costs money to receive them.

B．It's free to store them.

C．It takes time to access them.

D．It takes time to throw them away.
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填空题

请在下面代码中加入监听器语句 【15】 。
import java.awt.*;
import java.applet.Applet;
public class Simple extends Applet implements MouseListener

StringBuffer;
Public void init()

______//加监听器语句
buffer = new StringBuffer();
addItem("initializing..... ");

Public void moseEntered(MouseEvent event)

Public void moseExited(MouseEvent event)

Public void mosePressed(MouseEvent event)

Public void moseReleased(MouseEvent event)

Public void moseClicked(MouseEvent event)

addItem ("click!...");
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