1. (2018九上·深圳月考) 阅读理解

    Today, many endangered animals live in zoos. There, scientists work to keep each species(物种) alive. How do they do that? One way is by taking cells(细胞) from animals. Then the cells are frozen(冷冻). They can be used in the future to help animals reproduce.

    The San Diego Zoo has been freezing cells for 40 years. It's also called the Frozen Zoo. Now, the zoo is the biggest of its kind, with a large gene bank. It has cells from more than 1,000 species. One of the species is the northern white rhinoceros(犀牛).

    There are only five northern white rhinoceros alive in the world now. They are unable to have their children. Some scientists there want to use the bank's frozen cells to produce another northern white rhinoceros. They want to do this before the species dies out. That could happen by 2025.

    Can the zoo save the northern white rhinoceros? Other species have been saved successfully. So it's possible for the white rhinoceros too.

    Saving the white rhinoceros would be expensive. So some people don't think using frozen cells is the best thing to do. Some wonder whether it's worth spending millions of dollars on the species that nearly dies out. Some say scientists should work on the reasons why animals become endangered in the first place.

1. （1） What is the first passage mainly about?

   A . Why scientists want to keep each species alive. B . Introducing one way of keeping each species alive. C . Introducing the situation of endangered animals. D . How to freeze cells from animals.
3. （2） The underlined word "That" in the third paragraph refers to ______.

   A . reproducing the northern white rhinoceros B . the northern white rhinoceros dying out C . the northern white rhinoceros having babies D . freezing cells from the northern white rhinoceros
5. （3） Why do some people disagree on saving the white rhinoceros?

   A . Because they don't know why animals become endangered. B . Because the animals are useless to people. C . Because it's dangerous to save them. D . Because saving them is too expensive.
7. （4） From the passage we can learn that ______.

   A . scientists succeeded in saving some endangered animals B . it's good for the endangered animals to live in zoos C . the San Diego Zoo is famous for its gene bank D . people have known the reasons why animals become endangered