Every year on his wife’s birthday, Kevin always remembers ________ by the florist to buy some flowers for her.
(A) to stop
(B) stopping
(C) by stopping
(D) stopped
21. The price of oil began to fall again on Friday, giving up most of the gains it ________ the previous day in
the first rally in two weeks.
(A) making (B) had made (C) having (D) have made
Each year, an estimated 10,000 to 100,000 animal species die off. Scientists are now closing in on the ability
to bring back extinct species. No, this doesn’t mean the plot of Jurassic Park is going to become a reality.
Researchers need DNA to bring back a species. DNA is the chemical that carries the structure for a living thing.
Dinosaurs have been gone too long for any of their DNA to remain in fossils.
But there’s a very real chance that we will be able to bring back more recently extinguished species. This
could even include Ice Age animals like the woolly mammoth. In 2003, a team of Spanish and French scientists
re-created the Pyrenean ibex, which had gone extinct three years earlier. The new animal didn’t survive long, but
scientific advances should improve the success rate. In January, Australian scientists announced that they were on
their way to bringing back the gastric brooding frog.
Just because we can bring species back doesn’t mean that we should. There may be benefits to reviving a
species. But there’s no way to know how it will turn out. For example, would a passenger pigeon fit into its old
habitat? Or might it crowd out existing species?
Environmentalists worry that our ability to bring species back might cut down support for the hard work of
traditional conservation. Why worry about preserving a wildlife habitat if we know we can just reverse our
mistakes?
But those extinctions are our mistakes to correct, which may give us an obligation to do so. As businessman
and environmentalist Stewart Brand recently said, “Humans have made a huge hole in nature. We have the ability
now ... to repair some of that damage.”
【題組】48. Which of the following extinct animals has once been successfully brought back?
(A) The woolly mammoth.
(B) The Pyrenean ibex.
(C) The gastric brooding frog.
(D) The passenger pigeon.
23. You _________ the car before we hit the road. Now, our car has broken down and we are in the middle of
nowhere.
(A)should check (B)should have checked (C)shouldn’t check (D)shouldn’t have checked
24. With the recession and social unrest, there is ______ chance that we’ll make more than we did last year.
(A) very little (B) very a little (C) little very (D) a little very
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