摘要: Dinosaurs have completely died out on the earth.never again. (山东潍坊09届高三第二次模拟) A. to be seen B. being seen C. seen D. having been seen

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【小题1】You can’t use father’s car without his p_________.
【小题2】Having a b________ diet is good for our health.
【小题3】The math problem is so c_________ that no one in the class can work it out.
【小题4】I was wondering if you could do me a f_________, that is , to help me take care of my pets.
【小题5】The scientists spent 3 months g_________ information for the biological experiment.
【小题6】She left a very c________ message on my answering machine. I really couldn’t understand what she was trying to say.
【小题7】All the tourists were f__________ by the beautiful scenery of the city.
【小题8】Teaching is a tiring but a r___________ job, especially when you see the difference you’ve made in the life of your students.
【小题9】You are expected to a_______ to your parents when you made a mistake.
【小题10】Drinking too much is h_________ to one’s health.
【小题11】When he was a little boy, Tony usually __________(寻求)help from his parents and friends in time of trouble.
【小题12】Everyone sang and danced, enjoying the happy and relaxed __________(气氛) at the party.
【小题13】Hard work is ___________(基础的) to success.
【小题14】Customers who buy 10 at a time will get a 50% __________(折扣)。
【小题15】People in different countries have different customs and _________(宗教的) beliefs.
【小题16】The letter wasn't addressed to me but I opened it out of ___________(好奇).
【小题17】Working as a _____________(实习生) helped him to earn extra money.
【小题18】Dinosaurs ____________(存在) on the earth millions of years ago.
【小题19】_________(退休) at the age of 40 sounds boring.
【小题20】There are many __________(理论) about how the universe began.

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Directions:
    
Complete the following passage by using the words in the box. Each word can only be used once.
Note that there is one word more than you need.
A. poisoned        B. destruction       C. survived       D. increased      E. especially
F. chemicals       G. concern          H. decline         I. occasionally     J. sensitive
     More recent research has shown that many kinds of amphibians (两栖动物) are declining or have
become extinct. Amphibians are animals, such as frogs, that live partly in water and partly on land. And
they have been around for over 350 million years. They have   1   three mass extinctions, including the
extinction of the dinosaurs. Why are they dying out now?
     The most serious aspect of amphibian loss, however, goes beyond the amphibians themselves.
Scientists are beginning to think about what amphibian   2   means for the planet as a whole. If the earth
is becoming unlivable for amphibians, is it also becoming unlivable for other kinds of animals and human
beings as well?
Scientists now believe that amphibian decline is due to several environmental factors. One of these factors
is the   3   of habitat, the natural area where an animal lives. Amphibians are very   4   to changes in their
habitat. If they cannot find the right conditions, they will not lay their eggs. These days, as wild areas are
covered with houses, roads, farms, or factories, many kinds of amphibians are no longer laying eggs.
     There are a number of other factors in amphibian decline. Pollution is one of them. In many industrial
areas, air pollution has   5   the rain, which then falls on ponds and kills the frogs that live there. In farming
areas, the heavy use of   6   on crops has also killed off amphibians. Another factor is that air pollution has
led to    7   levels of ultraviolet (UV) light. This endangers amphibians, which seem to be   8   sensitive to
UV light.
     All these reasons for the disappearance of amphibians are also good reasons for more general   9   .
These factors affect human beings, too.
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