We all know that some animals have less and less land ________．

A．live in                     B．live on                    C．to live in                 D．to live on

Frogs are animals that can live both in water and on land. There are more than 5,000 kinds of frogs on the earth. The earliest known frogs lived about 190 million years ago and the frogs today still look the same. Here are some fun things that you might not know about frogs. Enjoy!

The Biggest and the Smallest Frogs

Some frogs can be very big. The biggest kind of frog is the Goliath Frog in West Africa. Its body can be nearly 30cm long, about the size of a large cat. The Gold Frog and the Poison Frog are the smallest frogs in the world. They are less than 1cm long. Though the Poison Frog is very small, it is not weak at all. It is dangerous. Any animal that eats it will die very soon.

The Best Jumpers

Frogs are very good at jumping. They developed jumping legs so that they would not be eaten by other large animals. Using their big strong legs, more frogs can jump over 20 times their own length. The Australian Rocket Frog can even jump over 2m, which is 50 times its body length (5.5 cm). That might be the reason why frogs are called the best jumpers on the earth.

The Cryogenic Animal

Some frogs like the Common Wood Frog have a special ability to live in very cold places. When the temperature goes down, they become ice frogs. 2/3of their body water freezes. Their hearts stop, and their breathing stops too. You may think they are dead, but in fact they are not. Maybe we humans can learn the way that the frogs do for medical purpose.

1.The earliest frogs lived about          million years ago.

A．20

B．30

C．50

D．190

2.      can jump over 2m.

A．The Goliath Frog

B．The Common Wood Frog

C．The Poison Frog

D．The Australian Rocket Frog

3.What will happen to a Common Wood Frog at very low temperature?

A．It will die very soon.

B．It will be an ice frog.

C．It will become dangerous.

D．It will become very small.

Frogs are animals that can live both in water and on land. There are more than 5,000 kinds of frogs on the earth. The earliest known frogs lived about 190 million years ago and the frogs today still look the same. Here are some fun things that you might not know about frogs. Enjoy!
The Biggest and the Smallest Frogs
Some frogs can be very big. The biggest kind of frog is the Goliath Frog in West Africa. Its body can be nearly 30cm long, about the size of a large cat. The Gold Frog and the Poison Frog are the smallest frogs in the world. They are less than 1cm long. Though the Poison Frog is very small, it is not weak at all. It is dangerous. Any animal that eats it will die very soon.
The Best Jumpers
Frogs are very good at jumping. They developed jumping legs so that they would not be eaten by other large animals. Using their big strong legs, more frogs can jump over 20 times their own length. The Australian Rocket Frog can even jump over 2m, which is 50 times its body length (5.5 cm). That might be the reason why frogs are called the best jumpers on the earth.
The Cryogenic Animal
Some frogs like the Common Wood Frog have a special ability to live in very cold places. When the temperature goes down, they become ice frogs. 2/3of their body water freezes. Their hearts stop, and their breathing stops too. You may think they are dead, but in fact they are not. Maybe we humans can learn the way that the frogs do for medical purpose.
【小题1】The earliest frogs lived about          million years ago.

　　Forests are large pieces of land covered with big trees. They are found all over the world, especially in places where there is enough sunshine and much rainfall. Many kinds of materials（材料）come from forests. To build a house, we need wood for doors and windows. Beautiful chairs and tables are also made of wood.

　　Teak（柚木）wood is very useful for ship-building. It is used for all parts of a ship where wood and metal come in contact（接触）, for it has a kind of oil to keep metal away from rust（铁锈）. It can also stop the attack of white ants and other insects. For this, teak wood is an important railway building material.

　　Forests are no less important than useful. They are the home of wild animals. Without them, those animals would run among the places where we live and work. There would be no peace for man.

　　Forests are helpful to weather, too. When it is very hot, they can be a good place for people to stay away from the sun. In winter, they can keep us from the cold. Forests can also stop the land from being washed away by heavy rain for the trees hold the soil together. So it would be foolish to cut down trees freely.

(1) From the first paragraph（段落）, we know it's NOT true that ________.

[　　]

A．forests are everywhere in the world

B．there must be big trees in a forest

C．wood is useful in building houses

D．forests need sunshine and rainfall

(2) Teak wood is very useful for ship-building because ________.

[　　]

A．most ships are made of wood

B．it can come in contact with metal

C．it can stop white ants' or other insects' attack

D．a kind of oil in it can protect metal from rust

(3) The expression“no less important than useful”in Paragraph 3 means ________.

[　　]

A．more important than useful

B．not so important as useful

C．as important as useful

D．neither important nor useful

[　　]

A．forests are large pieces of land covered with big trees

B．wood is good material to build ships, railways and some other things

C．without forests, we have to live together with wild animals

D．forests are useful to us in many ways