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(A)
Birds live in trees. Squirrels（松鼠）live in trees. But did you know that some frogs（蛙）live in trees, too?
The tree frog is hard to find. It can change colors. On green leaves, it stays green. On a brown branch（树枝）, it turns brown. Some tree frogs can change from green to gold or blue.
Tree frogs have legs and wide feet. They have sticky pads（粘性的肉趾）at the ends of their toes. These sticky toe pads keep the tree frogs from falling. Tree frogs have different colors and markings（斑点）on their skins. Their eyes are different, too. Some have green eyes, and others have bright red ones.
The sound they make are different, too. One frog makes a sound like a dog barking. Another frog makes a loud noise like a snore（打鼾）. There is even a frog that whistles（吹口哨）!
( )71.These frogs are hard to find because ______.
A. they stay in trees B. they can change their colors
C. they have sticky pads D. they make surprising sounds
( )72.If the season is spring, the colors of tree frogs is _______.
A. gold B. brown C. green D. blue
( )73.The tree frogs can stay on trees because ______.
A. they have sticky pads B. they can change their colors
C. they are strong D. they are small
( )74.Which of the following sentences is right?
A. The tree frogs have different colors and feathers（羽毛）on their skins.
B. The tree frogs can’t make a loud noise like a snore.
C. We can easily tell tree leaves from tree frogs.
D. We may find tree frogs if we hear a sound like a snore in the forest.
( )75.The passage is mainly about ______.
A. the colors of a special frog B. the sound of a special frog
C. the eyes of a special frog D. a frog that is special
(B)
Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it’s chance in million.
People have made a survey of colors of more than four thousand kinds of flowers and found that only eight of them are black.
As we know, sunlight is formed (形成) by seven different colored lights. The wave length (波长) of each light is different, so the quantity (量) of heat in each light is also different. Flowers especially their petal (花瓣), are easy to be harmed (伤害) 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 (很少) survive (挺过) sunlight. But red flowers, orange flowers and yellow flowers can protect (保护) themselves from sunlight by reflecting (反射) the red light, orange light and yellow light, each of which has a large quantity of heat.
( )76.People can_______ see black flowers.
A. often B. never C. hardly ever D. always
( )77.The underlined word “ them” in the second paragraph refers to (指) ______.
A. a thousand B. colors C. flowers D. kinds
( )78.The passage mainly tells us that _______.
A. black flowers are too weak and it is difficult for them to grow up
B. there are only eight black flowers in n
C. sunlight has seven different colored lights and the wave length of each is different
D. why it’s difficult for black flowers to grow
( )79.How do red flowers, orange flowers or yellow flowers protect themselves from sunlight?
A. By taking in the light. B. By reflecting the light.
C. By hiding themselves. D. By sleeping.
( )80.Which of the following ideas is NOT right?
A. The black flowers cannot protect themselves from the sunlight.
B. Red, orange and yellow flowers can also take in the light of all wave lengths.
C. People have found that only a few kinds of flowers are black.
D. Flowers are easy to be harmed by very high temperature.
Key: 71-75 BCADD 76-80 CDDBB
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