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Biodiversity(生物多样性), or biological diversity, is a wide-ranging concept that covers all the different kinds of plant and animal species present on earth. Environmentalists believe that many millions of species exist. As all these living organisms are dependent on each other in some way, biodiversity is desirable. Any loss to the planet is actually a loss for mankind as well, and it is our responsibility to try and save Earth’s biodiversity.
Biodiversity has a vital role to play in the evolution（演变）of species. Species become extinct, but new species evolve, and this is how a balance is maintained. This may sound pretty simple, but it takes millions of years for changes to take place.
Biodiversity is also very important to the stability of food webs. Damage to them can mean disaster for an entire ecosystem. The extinction of a single animal species can put huge pressure on the numerous other species dependent on it.
Biodiversity also has an important role to play in human society. Apart from being the most intelligent species on earth, human beings are also the most dependent. We depend on nature to meet our basic needs. When we change the balance of nature to create our cities and bring about our technical advances, we knowing or unknowing cause great damage to the ecosystem. This must be understood, and the damages must be reversed（颠倒）in any way they can to ensure that the balance of the ecosystem is maintained.
【小题1】We learn from the first paragraph that_________.
A biodiversity can be seen
B all living species are found on earth.
C people everywhere are aware of the importance of biodiversity
D the loss of any species can affect humans
【小题2】Why can change in food webs lead to disaster?
A Because it can make people suffer from disease
B Because it can put huge pressure on some species
C Because it takes a long time for such changes to take place
D Because it will damage ninety-nine percent of species
【小题3】What does the underlined word probably mean?
A Immovability B Peace C Strength D Variety
【小题4】We learn from the last paragraph that __________.
A humans are as independent as they are intelligent
B the balance of the ecosystem is easily maintained
C nature has given us a lot
D nature is taking revenge on us
【小题5】Which of the following may be the best title for this passage?
A Food Webs are Closely Related to Biodiversity.
B Biodiversity Plays a Very Important Role in Evolution
C How Biodiversity Affects Human Society.
D Understanding Biodiversity and Its Importance. 查看习题详情和答案>>
I enjoy learning English ________ it takes me a lot of time.
A．unless B．though C．because D．so
查看习题详情和答案>>
用括号内所给动词的适当形式填空。
【小题1】My father often _________(try) Bejing Duck in the restaurant.
【小题2】Please stop talking. The baby ___________(sleep).
【小题3】_______ this key ring _________(belong) to the little boy?
【小题4】Mary enjoys________（share）her toys with her friends.
【小题5】The Greens __________ (learn) Chinese in the room at the moment.
【小题6】It takes Madee ten minutes _______ (climb) a ladder _______(get) into her house.
【小题7】Why not ________(take) them to the sports centre?
【小题8】Neil would like ________(visit) the Palace Museum tomorrow.
【小题9】Mother makes the girl ________(play) the piano all day long.
—__________ is it to your hometown from here?
— Well, it takes over three hours to get there by coach.
| A．How soon | B．How much | C．How long | D．How far |
阅读下列短文，根据短文内容填写表格 (每空限填一词)。
How do you feel when you have to make a speech in front of class? What about when you go to a birthday party? Do you get really shy?
Shyness means feeling nervous or frightened when you’re around other people. Experts (专家) have found that more than 80 percent of middle school students feel afraid to be the centre of attention. Some kids are born shy. Some become shy later because of their life experiences.
It’s OK if it takes you a while to feel yourself again when you go to a new place or meet new people. In fact, everybody gets a little shy sometimes. It’s just a case of how much.
Most people have red faces and talk in broken sentences when they get shy. But some become so shy that they won’t go to a restaurant because they are too nervous to order and pay the bill (账单). Some are afraid of meeting new people, so they seldom go outside. This kind of shyness can be bad for a person.
If shyness doesn’t stop you from doing something you want to do, being shy isn’t a very big problem. Some experts say shy people are quieter and cleverer because they think more and talk less. Shy people are also good at working with others because they think more for other people. Some great people in history were shy, too.
You see, being shy isn’t all bad. But remember not to let good chances pass by just because of it! If you have to sing a song at a birthday party or practice your spoken English in front of others, just do it! There’s nothing to be afraid of.
Shyness
| Meaning | To feel【小题1】 or frightened | |
| Causes | To be the【小题2】 of attention To be born shy To have 【小题3】 experiences | |
| Effects | 【小题4】 effects | To have red 【小题5】 To talk in【小题6】 sentences To be 【小题7】 of meeting new people |
| Good effects | To be quieter and【小题8】 To be good at 【小题9】 with others | |
| Advice | To take hold of (抓住) good 【小题10】 | |