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.
完形填空 先通读下面的短文，掌握其大意，然后在所给选项中，选出最佳选项。
At the beginning of this century, medical scientists made an interesting discovery: we are built not just of flesh (肌肉) and blood but also of time. They were able to show that we all have a ‘body clock’ 1 us, which controls the 2 and fall of our body energies. It can 3 us different from one day to the next.
The idea of a ‘body clock’ should not be too 4 because the lives of most living things are controlled by the 24-hour night-and-day cycle (循环). We feel 5 and fall asleep at night. We become 6 and energetic during the day. Most people will have a bad feeling if the 24-hour cycle is 7 . For example, people who are not used to working at night can find that lack (缺少) of sleep causes them to 8 badly at work.
9 the daily cycle of sleeping and waking, we also have other cycle which lasts longer than one day. Most of us would 10 that we feel good on some days and not so good on others; sometimes our ideas seem to be so active and at other times, they are not.
1. A．beside B．inside C．outside D．under
2. A．life B．offer C．use D．rise
3. A．show B．treat C．make D．change
4. A．difficult B．natural C．surprising D．frightening
5. A．quiet B．tired C．comfortable D．cheerful
6. A．regular B．serious C．lively D．clear
7. A．disturbed B．pushed C．restarted D．troubled
8. A．perform B．suffer C．count D．control
9. A．With B．As well as C．Except D．Rather than
10. A．afford B．admire C．advise D．agree
---I have some big news for you. You’ve been accepted as a member of our club.
--- That’s great!
A．Have I? B．Pardon? C．Congratulations! D．Good idea!
All the students _____two groups by the teacher during the competition.
A．were divided into
B．were divided
C．divide into
D．divided into
You don’t know _____ I want to see you again. It’s a year since I last saw you.
A．how soon B．how long
C．how often D．how much
---Ann goes to play football every day.
---Oh? But she ______ it.
A．used to hate
B．used to love
C．is used to hating
D．is used to loving
