Question

    Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it’s a chance in million. People have made a census (普查) 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 wave length of each light is different, so the quantity 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 all the light waves which cause the flowers to dry up in a high temperature. So black flowers can rarely survive sunlight. But red flowers, orange flowers and yellow flowers can protect themselves from sunlight by reflecting the red light, orange light and yellow light, each of which has a large quantity of heat.

1.It is _________ to see a black flower.

A.impossible B.seldom

C.common D.no chance

2.The passage tells us that ________________.

A.black flowers are so weak that it is difficult for them to grow up.

B.there is only eight black flowers in nature.

C.sunlight is formed by seven different colored lights, so the wave length of each light is different.

D.black flowers can take in the light of all the wave lengths which make them dry up because of high temperature.

3.Which of the following ideas is NOT true?

A.People have found that only a 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 the light of all wave lengths.

D.The black flowers cannot protect themselves from sunlight.

Answer

1.B

2.D

3.C

【解析】

这是一篇说明文。文章主要讲述黑色花朵不易在阳光下存活的原因。

1.

细节理解题。由第二句“If we have seen a black flower, it’s a chance in million.”和第三句“People have made a census (普查) to colors of more than four thousand kinds of flowers and discovered that only eight of them are black.”可知，如果我们看见过黑色花朵，那是千载难逢的机会。人们做过一份超过4000种花朵颜色的普查，发现其中只有8朵是黑色的。由此可见，很少可以看见一朵黑色花朵。结合选项可知，选项B正确。

2.

细节理解题。由第七句“Black flowers can take in all the light waves which cause the flowers to dry up in a high temperature.”可知，黑色花朵可以吸收所有的光波，这导致花朵在高温下干涸。由此可见，这篇文章告诉了我们黑色花朵能吸收所有的光波，这使得它们因为高温而干死。结合选项可知，选项D正确。

3.

细节理解题。由最后一句“But red flowers, orange flowers and yellow flowers can protect themselves from sunlight by reflecting the red light, orange light and yellow light, each of which has a large quantity of heat.”可知，但是红色花，橘黄色花，黄色花可以通过反射有大量热量的红光，橘黄色光以及黄光来保护自己免受太阳伤害。由此可见，红色花，橘黄色花，黄色花反射光波，而不吸收光波。结合选项可知，选项C表达的是“红色，橘黄色和黄色花也能吸收所有光波”，这不符合最后一句表达的“反射光波”，表达错误，故选C。