Each day every person in the United States throws away more than five pounds of garbage(垃圾). There is more garbage now than ever before and most of it is made up of the packages and cans in which we put our food. The traditional way of getting rid of solid wastes is quickly becoming inadequate. Many cities are experimenting with newer ways of handling their growing piles of garbage.
One of these new ways is "recycling"(回收使用). Through recycling usable materials are taken out of garbage and made into something else. These usable parts of garbage are put through the cycle of going from a raw material to a finished product again.
In some cities a machine called Hydrapulper is being used to help recycle garbage. A Hydrapulper is like a huge mixing machine. The garbage is dropped onto a conveyor belt (传送带) that feeds the machine. At the same time, water is pumped into the Hydrapulper. With a mixing action, the Hydrapulper throws out the heavy metal objects that can later be sold as waste metal. The rest of the garbage—paper, food, plastic, rubber, glass, wood, leaves, and other items—falls apart. The waste is then mixed with water and carried to another piece of equipment where glass, sand and small pieces of metal are thrown out.
With the Hydrapulper, up to 95 percent of the original garbage is made again useful. The rest turns into furnace ash(炉灰).

A:It throws away glass and sand from garbage. B:It collects heavy metal objects for selling. C:It separates garbage into useful and useless things. D:It pumps water into garbage and mixes it.

OutputStreamWriter类包含的方法主要有( )。

A:public OutputStreamWriter(OutputStream out) B:public voidwrite(intc) throws IOException C:public voidwrite(String str)throws IOException D:public flush throws IOException

声明异常抛出用下列哪个子句来完成声明，它包含在方法的声明当中

A:throws B:throw C:Throwable D:Exception

声明异常抛出用下列哪个子句来完成声明，它包含在方法的声明当中

A:throws B:throw C:Throwable D:Exception

下列程序段，在运行时最后输出的内容是（ ）。 　　a=2 　　c=1 　　AAA: 　　c=c + a 　　If c＜10 Then 　　　　Print c 　　　　GoTo AAA 　　Else 　　　　Print "10以内的奇数显示完毕" 　　End If

A:public abstract int read( )throws IOException B:public final void writeInt(int v)throws IOException C:pubfic void close( )throws IOException D:pubfic int available( )throws IOExcepfion

声明异常抛出用下列哪个子句来完成声明，它包含在方法的声明当中

A:throws B:throw C:Throwable D:Exception