1 . Do you still remember Jurassic Park, an amazing movie where science brings dinosaurs back from extinction? Now some very smart scientists are working on a way to revive, not dinosaurs, but other extinct species like the woolly mammoth （长毛象）using the gene editing technology known as CRISPR.

As an evolutionary biologist, obviously, it would be amazing to bring back extinct creatures. But even if we can bring them back, we are not going to be able to control how they evolve in the future. No man is an island and neither is any other creature. We need an ecosystem in order to survive. So we can think a lot about the examples of reintroducing species into the environment, like the gray wolves into Yellowstone. Ecology is very complicated and it certainly wasn't important when we first introduce rabbits into Australia, which was a total disaster eventually.

All animals like birds and mammals have to learn from their parents. If we bring them back to life, who are going to be around to teach them? We have examples where in California we've had the reproduction of the condors （秃鹰）.What scientists tried to do is to feed the babies using a mother condor puppet. When these poor creatures were released into the wild, they had an unnatural liking for humans. They didn't behave the way they should have, for condors.

According to Performing Animal Welfare Society, a healthy elephant costs about $70,000 per year to care for and an elderly elephant costs a good deal more. Of course, we are not talking about one. We're talking about many creatures. I don't think these creatures will have a future.

1. Why does the author mention the film in the first paragraph?

A．To recall an amazing movie.

B．To promote some extinct species.

C．To introduce the topic to be discussed.

D．To get to know some intelligent scientists.

2. What does the author want to tell us by the examples in paragraph 2?

A．Humans need a balanced ecosystem to survive.

B．To bring back extinct creatures was an unwise idea.

C．Helping endangered species proves to be beneficial for humans.

D．There were all sorts of positive effects about reintroducing species.

3. Which animal didn't act in its own way?

A．Condor.

B．Gray wolf.

C．Rabbit.

D．Elephant.

4. What can be a suitable title for the text?

A．Is Jurassic Park an Amazing Movie?

B．What do Creatures Need to Survive?

C．Should We Bring Extinct Animals Back to Life?

D．How does an Evolutionary Biologist Protect Animals?