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suffer when we try to get by with too little shuteye. So it's fortunate that our bodies do such a good job
of waming us when it's time to hit the sack.
Like humans, other animals also take time out to rest. You've probably seen a lion dozing at the zoo,
or maybe watched our dog snooze away lying in its bed. In fact, sleep is a necessity for every animal that's
ever been studied.
How long animals sleep, though, varies widely. Elephants and giraffes sleep only about 2 to 4 hours a
day, while bats may nod off for up to 20 hours. Ducks sleep together, and the birds on the edge of the group
sleep with the outside eye open and half of their brain awake-probably to keep watch while the other half of
their brain snoozes. Some birds may even sleep while flying. The fact that all animals make time for sleeping,
even under very dangerous situations, suggests that sleep is very important. And indeed, some facts suggest
that sleep is important for leaming and forming permanent memories.
But sleep may also be primarily a way for animals to save energy and stay out of harm. This may help
explain why meat-eating creatures sleep more than herbivores, which are animals that live only on plants.
Herbivores, like cows and zebras, need to spend more time searching for and grazing on food than meat eaters
do, such as lions and other big cats. So a big cat might be better off sleeping for a while after it eats, rather
than prowling around and risking injury.
But that's just a guess. Scientists need to study other animals as well before they can fully understand the
benefits (好处) of sleep and know which benefits are most important for a particular species (物种).
One thing is certain: enough sleep is important to health and learning. So give in when a strong wish to
sleep hits, and catch plenty of ZZZs.
B. to drink something
C. to get up
D. to go to sleep
B. if you want to sleep in class, fall asleep immediately
C. you are easy to give in if you have plenty of sleep
D. if you have a strong wish to sleep, you are perhaps ill
B. how animals sleep in the open air
C. why animals need sleep
D. when animals feel sleepy
It’s germs(微生物) that makes us ill. There are germs everywhere, They are very small and you can’t find them with your own eyes, but you can see them with a microscope(显微镜)They are very small and there may be hundreds of them on a very small thing, Germs can always be found in dirty water. When we look at dirty water under the microscope, we shall see them in it. Germs can also be found in air and dust(灰尘). If you cut your finger, some of the dust from the floor may go into it, and you will have much pain in it. Sometimes the germs will go into all of your bodies, and you will have pain everywhere.
To keep us healthy, we should try our best to make our environment cleaner and tidier. This needs us to work together.
小题1:Germs are________.
| A.very small things that you can’t see with your eyes. |
| B.the things that don’t effect people. |
| C.the things that you can find with your eyes. |
| D.the things that are very big. |
| A.I will feel nothing. | B.I won’t mind. |
| C.I will feel tense. | D.I will feel painful. |
we like working when we are ill
B. germs can’t live in the water.
C. we can’t feel ill if the environment is bad.
D. we feel well when the environment is good.
小题4:From the passage we know that________.
| A.Environment doesn’t affect our life |
| B.We don’t need to improve our environment |
| C.Germs may make us ill |
| D.If the environment is better, germs will be more. |
Everyone likes living in a clean and comfortable environment. If the envionment(环境) is bad, it will affect(影响)our bodies, and make us not feel well. Sometimes we may be terribly ill. At that time we don’t want to work, and we have to stay in bed and rest at home. So the envrionment is very important to us.
It’s germ that makes us ill. There are germs everywhere, They are very small and you can’t find them with your own eyes, but you can see them with a microscope(显微镜). They are very small and there may be hundreds of them on a very small thing, Germs can always be found in the dirty water. When we look at dirty water under the microscope, we shall see them in it. Germs can also be found in air and dust(灰尘). If you cut your finger, some of the dust from the floor may go into it, and you will have much pain in it. Sometimes the germs will go into all of your boby, and you will have pain everywhere.
To keep us healthy, we should try to our best to make our environment become cleaner and tidier. This needs us to act together.
【小题1】The writer tell us that________.
| A.we like working when we are ill |
| B.germs can’t live in the water. |
| C.we can’t feel ill if the environment is bad. |
| D.we feel well when the environment is good. |
| A.very small things that you can’t see with your eyes. |
| B.the things that don’t effect people. |
| C.the things that you can find with your eyes. |
| D.the things that are very big. |
| A.on the small thing | B.in air and dust |
| C.only in dirty water | D.everywhere |
| A.I will feel nothing. | B.I won’t mind. |
| C.I will feel tense. | D.I will feel painful. |
| A.environment doesn’t affect our life. |
| B.we don’t need to improve our environment. |
| C.germs may make us ill. |
| D.if the environment is better, germs will be more. |
Everyone likes living in a clean and comfortable environment. If the envionment(环境) is bad, it will affect(影响)our bodies, and make us not feel well. Sometimes we may be terribly ill. At that time we don’t want to work, and we have to stay in bed and rest at home. So the envrionment is very important to us.
It’s germ that makes us ill. There are germs everywhere, They are very small and you can’t find them with your own eyes, but you can see them with a microscope(显微镜). They are very small and there may be hundreds of them on a very small thing, Germs can always be found in the dirty water. When we look at dirty water under the microscope, we shall see them in it. Germs can also be found in air and dust(灰尘). If you cut your finger, some of the dust from the floor may go into it, and you will have much pain in it. Sometimes the germs will go into all of your boby, and you will have pain everywhere.
To keep us healthy, we should try to our best to make our environment become cleaner and tidier. This needs us to act together.
【小题1】The writer tell us that________.
| A.we like working when we are ill |
| B.germs can’t live in the water. |
| C.we can’t feel ill if the environment is bad. |
| D.we feel well when the environment is good. |
| A.very small things that you can’t see with your eyes. |
| B.the things that don’t effect people. |
| C.the things that you can find with your eyes. |
| D.the things that are very big. |
| A.on the small thing | B.in air and dust |
| C.only in dirty water | D.everywhere |
| A.I will feel nothing. | B.I won’t mind. |
| C.I will feel tense. | D.I will feel painful. |
| A.environment doesn’t affect our life. |
| B.we don’t need to improve our environment. |
| C.germs may make us ill. |
| D.if the environment is better, germs will be more. |
Everyone likes living in a clean and comfortable environment. If the envionment(环境) is bad, it will affect(影响)our bodies, and make us not feel well. Sometimes we may be terribly ill. At that time we don’t want to work, and we have to stay in bed and rest at home. So the envrionment is very important to us.
It’s germ that makes us ill. There are germs everywhere, They are very small and you can’t find them with your own eyes, but you can see them with a microscope(显微镜). They are very small and there may be hundreds of them on a very small thing, Germs can always be found in the dirty water. When we look at dirty water under the microscope, we shall see them in it. Germs can also be found in air and dust(灰尘). If you cut your finger, some of the dust from the floor may go into it, and you will have much pain in it. Sometimes the germs will go into all of your boby, and you will have pain everywhere.
To keep us healthy, we should try to our best to make our environment become cleaner and tidier. This needs us to act together.
1.The writer tell us that________.
A.we like working when we are ill
B.germs can’t live in the water.
C.we can’t feel ill if the environment is bad.
D.we feel well when the environment is good.
2.Germs are________.
A.very small things that you can’t see with your eyes.
B.the things that don’t effect people.
C.the things that you can find with your eyes.
D.the things that are very big.
3.Where can germs be found? They can be found_________.
A.on the small thing B.in air and dust
C.only in dirty water D.everywhere
4.How will you feel if germs go into the finger that is cut?
A.I will feel nothing. B.I won’t mind.
C.I will feel tense. D.I will feel painful.
5.From the passage we know that________
A.environment doesn’t affect our life.
B.we don’t need to improve our environment.
C.germs may make us ill.
D.if the environment is better, germs will be more.
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