装配式结构吊装时，起重机应根据( )选择。 A．建筑物的结构形式 B．建筑物的高度

下列有关环境质量标准的说法哪一个是不正确的( )。

A．环境质量标准包括国家环境标准和各级地方政府制定的地方环境标准

B．对国家污染物排放标准已作规定的项目，可以制定严于国家污染物排放标准的地方污染物排放标准

C．凡是向已有地方污染物排放标准的区域排污的，应当执行该地方标准

D．地方污染物排放标准必须报国务院环境保护行政主管部门备案

Directly he arrived the bus station, then ____ he had intended to take.

A．a bus did come

B．a bus came

C．came a bus

D．did a bus come

______the Internet is of great help, I don’t think it’s a food idea to spend too much time on it.

A．If

B．While

C．Because

D．As

下面是一个Applet程序，其功能是进行整数加法运算，要求有3个文本区域，2个作为输入， 1个作为输出，并且由异常处理来判断输入的数字是否为整型，如果是则进行运算，否则抛出异常并显示在第3个文本区域中。请改正程序中的错误(有下画线的语句)，使程序能输出正确的结果。
注意：不改动程序的结构，不得增行或删行。
import java．awt．*；
impoat java．awt．event．*；
impoat java．applet．Applet；
/*
＜applet code="exl7_3．class"，width=800 heiSht=400＞
＜/applet＞
*/
public class exl7_3 extends Applet implements ActionListener
TextField tfl=new TextField(5)；
TextField tf2=new TextField(5)；
TextField tf3=newTextField(5)；
Label 11=new Label("+")；
Label l2=new Label("=")；
Button btn=new Button("add")；
public void init( )
add(11)；
add(tf1);
add(tf2)；
add(12);
add(tf3)；
add(btn)；
btn．addActionListener(this)；

public void actionPerformed(ActionEvent ae)
try
int a=Integer．parseInt(tf1．getText())；
int b=Integer．parseInt(tf2．getText())；
int x=a+b；
tf2．setText(Integer．toString(x))；

catch(NumberFormatException nfe)
tf3．setText("error!")；



ex19_3．html
＜HTML＞
＜HEAD＞
＜TITLE＞exl9_3＜/TITLE＞
＜/HEAD＞
＜BODY＞
＜applet code="ex19_3.clasS"width=800 height=400＞
＜/applet＞
＜/BODY＞
＜/HTML＞

A variety of illegal acts committed by people in the course of their employment, for their own personal gain, are collectively known as white-collar crime. Embezzlement, theft and trading securities (1) insider information are common forms of white-collar crime. The majority of cases involve low-level employees who steal because they are under (2) financial stress. Many plan to (3) the money back as soon as possible but may never do so. Their crimes are usually never (4) because the amounts of money are small, and no one notices the (5) .

(6) , there are some very large cases of white-collar crime, such as multimillion-dollar stock market or banking seams that take years to discover and are extremely difficult and expensive to (7) .

White-collar crime is not (8) to the business sector. Government employment, especially (9) the city level, also provides opportunities to (10) one’s pockets. (11) , building inspectors accept bribes and full-time employees receive (12) payments.

Although white-collar crime is less (13) than street crime, it involves (14) more money and harm to the public than crimes committed by street criminals. It is (15) that there are more criminals (16) the office suites than in the streets, yet the (17) of white-collar makes it difficult to uncover the offenses and pursue the offenders. As the economy (18) from manufacturing to services and electronic commerce, opportunities for white-collar crime (19) , while the technology needed to stop such crimes will (20) .

11（）

A. Such as

B. For example

C. By the same token

D. To begin with