1. 根据短文理解，选择正确答案。

Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it's chance in a million.

People have made a survey to colors of more than four thousand kinds of flowers and discovered that only eight of them are black.

As we know, sunlight is formed by seven different colored lights. The wavelength of each light is also different, so the quantity (量）of heat in each light is also different. Flowers, especially their petals (花瓣), are easy to be harmed by high temperature.

Black flowers can take in the light of all the wavelengths that make them dry up because of high temperature, so black flowers can hardly resist (抵抗）sunlight. But red, orange and yellow flowers can protect themselves from sunlight by reflecting (反射) the red light, orange light and yellow light, each of which has a large quantity of heat.

1. （1） It is             to see a black flower.

   A . impossible B . two fifths C . very common D . chance in a million
3. （2） The passage tells us that           .

   A . black flowers are so weak that it is difficult for them to grow up B . there are only eight black flowers in nature C . sunlight is formed by seven different colored lights including black D . black flowers can take in the light of all the wavelengths that make them dry up because of high temperature
5. （3） Which of the following ideas is NOT TRUE?

   A . People have found that only few kinds of flowers are black. B . Flowers are easy to be harmed by very high temperature. C . Red，orange and yellow flowers can also absorb (吸收）the light of all wavelengths. D . The black flowers can't protect themselves from sunlight.
7. （4） From the passage we know the red, orange and yellow light have           .

   A . less heat than the other lights B . more heat than the other lights C . very little light D . a large quantity of light