进入岩洞或旧矿老井、老窿、竖井、探井，应预先了解有关情况，采取（）措施，并进行（）气

阅读理解。

     What do people do with their old, out-of-date but still useful computers? Most people don't know what to

do with them. Many old computers are put away in homes. Many more are simply thrown out with the rubbish.　　 Some companies are thinking of ways to bring down the number of old computers. Sony has agreed to help

recycle old Sony products. Dell, Hewlett-Packard and other companies now also take back some old computers.　　      In some countries, laws are being passed, too. Computer companies will have to collect and recycle their

used products. And 70% of computer waste must be recycled. The idea behind the laws is that computer

companies themselves should pay the cost. That will encourage them to make computers that are easier and

cheaper to repair and upgrade (升级).　　

     Yet while many people are throwing away good computers, others cannot afford them at all. Hundreds of

organizations are working to solve this problem. They collect and repair old computers. Some also teach others

how to repair computers.　　

     The computers then go to schools, charities and people who need them. Giving a used computer to one

of these organizations can turn one person's rubbish into someone else's useful things-and cut down on waste,

too.　　

1. How do people usually deal with their old computers?　　

A. They stop using them.

B. They give them to others.

C. They fix them up.　　

2. What do some computer companies do to bring down the number of old computers?　　　

A. They don't do anything about them.　　

B. They take back some old ones. 　　

C. They donate them to some charities

3. According to some countries' laws, what must computer companies do?　　 　

A. Collect and recycle most of computer waste. 　　

B. Repair and upgrade old computers. 　　

C. Make much cheaper computers.

4. What may people who can't afford computers think of the used computers?　　

A. Expensive.

B. Useful.

C. Out-of-date.　

5. What is the passage about?　　

A. Repairing old computers.　　

B. Selling old computers. 　　

C. Recycling old computers.

把金属X放人CuCl₂溶液中有红色物质析出，放人MgCl₂溶液中无现象．则X、Cu、Mg三种金属活动性由强到弱的顺序正确的是（　　）

A．Mg、X、Cu

B．Cu、X、Mg

C．Mg、Cu、X

D．X、Mg、Cu

参考下列熔点数据回答：

物质	NaF	NaCl	NaBr	NaI
熔点/℃	995	801	755	651
物质	NaCl	KCl	RbCl	CsCl
熔点/℃	801	776	715	646

钠的卤化物从NaF到NaI及碱金属的氯化物从NaCl到CsCl的熔点逐渐_______，这与________有关。随_________增大_________减小，故熔点逐渐_________。

本机构涉诉案件数量是指银行业金融机构作为（）的案件数量之和。

A、原告向法院起诉

B、原告应诉

C、被告应诉

D、诉讼中以第三人身份参与诉讼

冰机停车后可以不盘车。