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阅读下面短文，掌握其大意，然后从各题所给的四个选项（A、B、C和D）中，选出最佳选项．
With their shiny, grey bodies, dolphins（海豚）appear to be large fish．____1____, they are really warm-blooded mammals. Although they can stay under the water for up to 15 minutes ____2____, the dolphins must come up to breathe air through a hole on top of their heads.
Dolphins are social animals. Many of them even ____3____ around humans. In addition to being playful; they are helpful to men. For example ____4____ 400 B.C. the Great poet Arion was saved from ___5____ by a dolphin. From then until now, dolphins have been helping swimmers, ____6__ in trouble. Swimmers, however ,are not ___7____ humans they help. In some parts of the world, they help men ____8____ fish.
Dolphins are very clever. Its brain is even larger than a human's. Therefore, some people think a dolphin ____9__ smarter than a man, but ____10___, brain size is not the only measure of cleverness. Besides, measuring dolphin's cleverness in other ways is not possible ___11____ men cannot talk with them. But we can almost ____12____ that dolphins can talk with each other. They make different ____13____ which seem to be at least a form of language. Up to now men ____14___ able to find out how dolphins are talking. So no one really knows what they are thinking. If we could talk with them, perhaps they could teach us to be ___15____ they seem to be.
－I'm leaving for Canada on a study trip next week．
－________．
Enjoy your time
That's all right
You're welcome
It's a pleasure
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grown into a tall tree and must have been there for a long time. The tree blocked the view and made the
office seem dull, unfortunately this happened to be the room assigned to me and I was depressed by it for
quite some time.
When the first spring came, everything was green except the locust tree. Secretly, I was very happy
because I had thought it had died.
One morning when I opened the window for fresh air, I unexpectedly smelt a familiar sweet scent
floating into my office but I couldn't name it. Suddenly, I realized it was the locust tree! The tree that I
thought dead was blossoming in full glory.
From then on, I usually came to the office very early to see dew forming on the locust tree blossoms
and every year was eager to see spring again.
During summer, the green leaves provided shade protecting me from the harsh sunlight, but allowing
enough light in to make it pleasant. In autumn, the leaves turned into many different colors. Its beauty
touched my soul. Many times I thought to take photos but never did. Then I had to leave in a hurry. Later
in life it became a great regret that I had not done so.
Actually, many times in our lives, we think we own something, therefore we don't cherish it. We don't
feel regretful until we lose it one day! Moreover, sometimes, we have to accept the things we don't want
and need to discover the hidden beauty to find unexpected joy!
B. that released first, then held
C. that held first, then released
D. that was not holding or releasing
B. Think twice before you leap
C. Treat everything calmly
D. Cherish what you've owned
B. to finish her work early
C. to do some cleaning
D. to avoid the burning sun
B. that I should have taken some photos
C. that I had to leave
D. that the tree died