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Many years ago，there were lots of trees on earth，because summer lasted a whole year．What was the forest like? It is not difficult to see，because parts of that ancient（古老的）forest still stand．It is the rainforest．Here，even in a sunny day water drops through the leaves．
Today's largest rainforest is in South America．It covers about a million square miles．All the trees are very tall；the young trees are nearly sixty feet high．But it is not easy for some to grow higher because very little sunlight leaches them．
Many trees are about 60 to 120 feet high．Some are even taller．The tallest trees can be 200 feet high．
In this forest of tall trees，plant life is rich，animal life is rich，too．At different heights live different animals and many different noises can let you know where they are．
根据短文内容，选择最佳答案。
1．There were lots of trees on earth many years ago because of the _________．
A．cold weather B．largest forest C．warm weather D．rainforest
2．A rainforest has enough _________．
A．trees B．rainfall（雨量） C．forest D．leaves
3．There is rainforest _________．
A．only in South America B．only in the old days
C．in some parts of the world D．below the sea
4．Young trees share little sunlight because _________．
A．tall trees are above them B．there isn't enough sunlight
C．they needn't much sunlight D．it is summer the whole year
5．You can always find different animals by _________．
A．their colors B．the noises they make
C．climbing the trees D．watching them carefully
查看习题详情和答案>>Locusts are super delicious food for birds,but it is not always an easy job for birds to catch them.It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies. The reason is that the colors of locusts change with the colors of crops(庄稼). When crops are young,locusts look green. But when autumn comes, locusts change to the yellow and brown color as crops do.
Brown bears,tigers and other animals move quietly through forests. They can’t be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark-colored and they live under the soil(土壤） in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order to survive,they have to hide themselves in the daytime and appear only at night.
Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over , its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all.
小题1:It is not easy for birds to catch locusts because____________.
| A．locusts are good runners | B．locusts can jump very high |
| C．locusts are smarter than birds | D．locusts can change their color |
| A．do not have bright colors |
| B．change their colors with the soil |
| C．do not live in a dark and wet environment |
| D．Eat colorful insects like butterflies and bees |
| A．繁殖 | B．产卵 | C．觅食 | D．生存 |
| A．changes its color | B．makes the water around it black |
| C．appears only at night | D．hides itself in the sea rocks |
| A．Some insects and animals have different skills. |
| B．Some insects and animals are clever than we think. |
| C．Some insects and animals use colors to protect themselves. |
| D．Some insects and animals can get used to the environment easily. |