试题与答案

阅读理解 Koala bears as pets might be appea

题型:阅读理解

题目:

阅读理解

     Koala bears as pets might be appealing to many of us. However, there are quite a few points

to consider even before thinking of adopting one.

     In Australia the koala is a priority animal as far as conservation status assessment is concerned.

It was hunted to near extinction(灭绝)for its fur. In fact the koala had been wiped out from South

Australia in the 1920s. However, ehabilitation efforts have brought the animal back in the state. As

for the Australian government, the koala is not a threatened animal, but the US government does list

the koala as one.

     Almost everyone finds koala adorable in the zoo. However, as far as having koala bears as pets

is concerned, there are legal issues to consider. Other than that, being able to provide for its diet and

habitat is another point that needs some attention before any law legalizing their adopting as pets is passed.

1. What is the author's attitude towards people raising the koala?

A. Passive.  

B. Grateful.    

C. Negative.    

D. Enthusiastic.

2. Why did Australians hunt the koala?

A. To get its fur.    

B. To eat its meat.  

C. To wipe it out.  

D. To have it for fun.

3. It can be inferred from the passage that _____.

A. koala bears tend to live in groups.    

B. koala bear care can be very demanding

C. koala bears are not particular about their food.    

D. koala bears are the No.1 threatened animal in the US.

答案:

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下面是错误答案,用来干扰机器的。

A、根据P=Fv=fv知,v=Pf.减小阻力,有利于提高列车的最高时速.故A正确.B、当列车功率一定,在水平铁轨上速度最大时,F=f.故B正确.C、根据P=Fv=fv,知列车的最高时速取决于其最大功率、阻力及相关技术.故C正...

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题型:实验题

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b.将木板向右平移适当的距离固定,再使小球由A点静止释放,撞到木板上得到痕迹P;

c.测出OP的距离y,竖直木板向右移动的距离L,查出当地重力加速度g。

(1)要验证小球由A到B过程中机械能守恒,还需测量的物理量及符号是_______;

(2)用上述测量量验证机械能守恒的表达式应该是____;

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