阅读理解。
Hunting
The days of the hunter are almost over in India. This is partly because there is practically nothing left to
kill, and partly because some steps have been taken, mainly by banning tiger-shooting, to protect those animals
which still survive.
Some people say that Man is naturally a hunter. I disagree with this view. Surely out earliest forefathers,
who at first possessed no weapons, spent their time digging for roots, and were no doubt themselves often
hunted by meat-eating animals.
I believe the main reason why the modern hunter kills is that he thinks people will admire his courage in
overpowering dangerous animals. Of course, there are some who truly believe that the killing is not really the
important thing, and that the chief pleasure lies in the joy of the hunt and the beauties of the wild countryside.
There are also those for whom hunting in fact offers a chance to prove themselves and risk death by design;
these men go out after dangerous animals like tigers, even if they say they only do it to rid the countryside of
a threat. I can respect reasons like these, but they are clearly different from the need to strengthen your high
opinion of yourself.
The greatest big-game hunters expressed in their writings something of these finer motives (动机). One
of them wrote.
"You must properly respect what you are after and shoot it cleanly and on the animal's own territory (领
地).You must fix forever in your mind all the wonders of that particular day. This is better than letting him
grow a few years older to be attacked and wounded by his own son and eventually eaten, half alive, by other
animals. Hunting is not a cruel and senseless killing-not if you respect the thing you kill, not if you kill to
enrich your memories, not if you kill to feed your people."
I can understand such beliefs, and can compare these hunters with those who hunted lions with spears
(矛) and bravely caught them by the tail. But this is very different from many tiger-shoots I have seen, in
which modern weapons were used. The so-called hunters fired from tall trees or from the backs of trained
elephants. Such methods made tigers seem no more dangerous than rabbits.
1. There is no more hunting in India now partly because _____.
A. it is dangerous to hunt there
B. hunting is already out of date
C. hunters want to protect animals
D. there are few animals left to hunt
2. The author thinks modern hunters kill mainly _____.
A. to make the countryside safe
B. to earn people's admiration
C. to gain power and influence
D. to improve their health
3. What do we learn about the big-game hunters?
A. They hunt old animals
B. They mistreat animals
C. They hunt for food
D. They hunt for money
4. What is the author's view on the tiger-shoots he has seen?
A. Modern hunters lack the courage to hunt face-to-face
B. Modern hunters should use more advanced weapons
C. Modern hunters like to hunt rabbits instead of tigers
D. Modern hunters should put their safety first
kg的列车以恒定不变的功率由静止沿平直轨道加速行驶，当速度增大到
=2m/s时，加速度
，当速度增大到
＝10m/s时，加速度
＝0.1m/
．如果列车所受阻力大小不变，求：