硫磺制酸装置吸收酸中二氧化硫溶解量随酸温的升高而（）；在硫酸浓度为93%～100%的

（）并称我国古代佛教石窟艺术三大宝库。

一艘远洋客轮从长江驶入东海时，它受到的浮力[ ]

A. 变大

B. 变小

C. 不变

D. 无法判断

Most people have heard the sound of bees among flowers. Bees live almost everywhere in the world except in the Arctic areas.

Many kinds of agriculture depend on these small, social insects. Without bees, fruit and nut growers as well as many other farmers would not have a crop.

There are more than 20,000 kinds of bees. But only honey bees make enough honey for people to use. Honeybees are highly-organized social insects. They work together in a group, called a colony（群体）. Each colony lives in a hive（蜂房）. It contains one queen bee -- she lays all the eggs from which the members of the colony come. Each colony has only a few hundred males, called drones. The majority of all bees in a colony are workers, which are all females.

Bees even have a special stomach, called a honey stomach,  which is used to store sweet fluid that the bees gather from flowers. Bees also have long hairs on their body and legs. These hairs capture pollen（花粉） as bees go from flower to flower. Some of the pollen is taken back to the hive. Some, however, is passed to the next flower. This is how many plants are fertilized. Pollen is the reproductive material of plants. Many important agricultural crops depend on bees for fertilization.

Inside their hives, bees store sweet liquid from flowers and pollen as well. They may even gather sweet liquid from some other kinds of insects. These kinds of sweet liquid are also stored in the hive.

Bees make honey through a process. They add liquid from their own mouths to sweet liquid into simple sugar. As the honey is stored, it dries. It becomes thicker and darker.

Although bees are often thought of as honey makers, they provide a surprising number of products. Also, their greatest economic value is in fertilizing crops-not in making honey.

小题1:The passage is mainly about             .

A．bees and their colony

B．the way for bees to pass pollen

C．bees and agriculture

D．the process for bees to make honey小题2:Honeybees are social insects because         .

A．they work in groups

B．there is queen bee in every colony

C．they live in a hive

D．each of them does the same job小题3:The most valuable thing honeybees do for people is in             .

A．making honey

B．fertilizing crops

C．making flowers grow better

D．producing pollen小题4:The word “fertilize” in the sentence “This is how many plants are fertilized” probably means “    ”.

A．to make plants strong and productive

B．to make soil rich for plants

C．to start the development of young flowers

D．to introduce pollen into plants

请完成下列Java程序：建立一个Applet程序，包括创建一个画布构件、一个面板构件，面板构件上包含3个按钮，用来设置画布和面板的背景颜色，这3个按钮(Red，Green，Blue)分别控制画布和面板背景色改变为三原色：红、绿、蓝。要求画布宽度300高度200。
注意：请勿改动main()主方法和其他已有语句内容，仅在下划线处填入适当的语句。
程序运行结果如下：

import java.awt.*；
import java.applet.*；
/*
＜applet code="ex6_2.class"width=800 height=400＞
＜/applet＞
*/
public class ex6_2 extends Applet
private Panel pane16_2;
private Canvas canvas6_2;
private Button btnl, btn2, btn3;
public void init()
canvas6_2=new Canvas();
canvas6_2.______________;
canvas6_2.setBackground(Color.black);
add(canvas6_2);
pane16_2 = new Panel();
pane16_2.setBackground( Color.black );
btn1 = new Button( "Red" );
btn2 = new Button( "Green" );
btn3 = new Button( "Blue" );
pane16_2.add( btn1 ;
pane16_2.add( btn2 ;
pane16_2.add( btn3 ;
____________;

public boolean action Event e, Object o
if( e.target == btn1 )
pane16_2.setBackground( Color.red );
canvas6_2.setBackground(Color.red);

else if( e.target == btn2 )
pane16_2.setBackground( Color.green );
canvas6_2.setBackground(Color.green);

else if( e.target == btn3 )
canvas6_2.setBackground(Color.blue);
pane16_2.setBackground( Color.blue );

return true;

合成系统需要紧急停车时，合成气压缩机怎样进行操作？