体积相等的甲、乙两个实心金属球，密度之比是1：2，比热容之比C甲：C乙=2：3，

(1)八年级学生李丽在放学的路上捡到一个钱包,内有身份证、银行卡和人民币若干。

①正确的做法:

②理由:

(2)小强自进入八年级后,随着科目的增多,产生了厌学情绪,恰好本村一位私企老板邀请他去打工。

①正确的做法:

②理由:

(3)小琳因为前一天晚上看电视时间太长,所以第二天早晨起来晚了,在去学校的路上,在路口碰到红灯。

①正确的做法:

②理由:

给水氨处理是为了中和给水中的H2CO3，以消除（）的腐蚀。

每个矿井必须有（）个以上能行人的安全出口。

阅读理解。

     Squirrels often communicate with whistles, chirps and chucks, which sound like the word "chuck".

Whistles and chirps are like the sounds that many birds make.Now scientists have translated some of

their squirrel-speak.

    Hare, a professor of zoology at the University of Maniloha in Winnipeg, and his team managed to

record squirrels' alarm calls.The researchers studied the sounds and then played them back to 60 wild

squirrels, which the scientists approached individually with a video recorder to capture (抓拍) their

reponses.Some squirrels lifted their heads up and became. Alert (警惕的).Creatures that were more

frightened simply ran for their lives and dived into caves.

     "In effect then, whistles that mix with chucks say 'there's an enemy of average threat that's here', and

whistles without chucks say 'there's an enemy of seemingly average threat around here somewhere', while pure chirps say, 'I'm hiding here because there's an immediate danger.' " Hare told.Discovery News.

     Hare and some other researchers believe such sounds arc part of an advanced language that develops

just as all other communication systems.

Although squirrels risk their lives when they call out to warn others of threats, other squirrels might admire

this behaviour, thus increasingly the caller's social status, like humans who look up to heroes. Hare added

that other animals, such as birds, probably understand at least some squirrel language, since they also may benefit from the alarm calls.

     In fact, another Canadian study found that deep-voiced, black-capped chickadees have their own

language too.According to certain research, there are a lot of tidings in chickadees' calls, such as directing

fellows' activities, keeping in contact between mates, and raising alarms.

While chickadees and other birds are often welcomed into gardens by homeowners, squirrels are

frequently viewed as pests (害兽). Hare wishes a greater understanding of the complex social lives and

communication systems of squirrels will provide "hope that humans will gain a greater appreciation and

stop doing harm to these animals".

1.The text mainly talks about       .

A. the study on the language of squirrels

B. the comparison between squirrels and chickadees

C. the calling for the protection of squirrels

D. the ways for squirrels to escape from their enemies

2. If a squirrel is in a very dangerous situation, it would probably make ____.

A. whistles with chucks  

B. pure chirps

C. whistles without chucks

D. repeated chucks

3. The underlined word "tidings" in pardgmph 6 probably means ____.

A. difficulties      

B. poises          

C. messages    

D. languages

4.What can be learned from this text?

A. Squirrels communicate with cach other as humans do.

B. Some squirrels understand the recorded alarm calls.

C. Other animals also well understand the language of squirrels.

D. Birds such as chickadees don't have their own language.

商业银行不可接受( )作为保证人。

A．企业法人的职能部门

B．自然人

C．金融机构

D．从事经营活动的事业法人