1. 阅读理解

Do you think animals can see colours? Scientists think that many animals cannot see colours. The world is black and white to them. Scientists want to find out if dogs can see colours.When the scientists give the dogs food, they show them a certain(某种) colour every time. The dogs get ready to eat when they see this colour. The scientists then show the dogs another colour. Again the dogs get ready to eat. The colours are all the same to them. Colours are not all the same to monkeys. For example, if we put food in a red box, and do this every day, a monkey will always go to the red box to get food. If we put food in a blue box, the monkey will refuse to go to it.

1. （1） Scientists show the dogs colours _________.

   A . to tell them to eat B . to find out if they can see black and white things C . for fun D . to find out if the they can see colours
3. （2） The dogs get ready to eat when they ________.

   A . hear different pieces of music B . see the monkeys C . see black things D . see all the colours
5. （3） Colours are ________.

   A . not all the same to monkeys B . not all the same to dogs C . different to dogs D . all the same to monkeys
7. （4） The underlined word "refuse" means ________ in Chinese

   A . 同意 B . 拒绝 C . 称赞 D . 乞求
9. （5） What is the main idea of the passage?

   A . Why animals like colours. B . Animals and colours. C . How animals tell colours. D . Animals don't like colours.