题目内容
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Two brightly colored butterflies have just flown by.They seems to be exactly alike, but actually one is a little larger than the other. 1 The smaller one has a wingspread of less than three inches and also a black line on its back wings.
At first sight, it is hard to tell them apart.Would you guess from this that they are different-sized butterflies of the same species? 2 If you said yes to either question, you would be wrong, for these look-alikes belong to quite different families.
The larger insect is the monarch butterfly(黑脉金斑蝶).As a baby insect, the monarch feeds on milkweed, which seems to give the monarch a disagreeable taste and smell. 3 Birds that eat butterflies soon recognize the monarch and quickly learn to leave it alone.
4 Birds would find this insect tasty, but because it looks like the monarch, birds keep away from it.The viceroy's similarity to the monarch gives it some protection from its enemies and helps it survive.
There are other pairs of look-alike butterflies, bees and moths.In each case, one either has a disagreeable taste or smell, or can give a painful sting(叮咬).The larger is called the model. 5 (词数206)
A.The smaller insect is the viceroy(副王峡蝶), which feeds on the leaves of trees.
B.The larger insect has a wingspread(翼长)of up to four inches.
C.The bright coloring of the monarch acts as a warning sign to its enemy.
D.Birds protect their babies from eating such dangerous enemies.
E.The insect that imitates this model for protection is called the mimic(保护色).
F.Or that they are different species of butterflies but close relatives belonging to the same family?
G.Do you like this kind of special species?
第二节(共5小题;每小题2分,满分10分)
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
In 1990 a report was published about what the earth might be like 20 years from then on. 71 According to the report,the picture of the earth in the year 2010 is not a pleasant one. 72 The population could be as large as 6300 million,almost 2150 million more than in 1985.More people would move into cities ,especially cities in developing countries.Cities like Cairo and Jakarta probably would each have 15 million by then.
73 Farmers will grow 90% more food than they did in 1985,but most of the increase would be in countries that already produce enough food for their people. 74 Poor farming ways are destroying large areas of crop land,changing farms into deserts.More farmland is lost as cities become larger and more houses are built.Air pollution will get worse as industrial countries burn more coal and oil.Many of the world's forests could disappear as more and more trees are cut down.Energy will continue to be a serious problem. 75 They only workde out the situation that exists today.By changing the situation,by settling the problems,the picture can be changed.There is still time for the nations of the world to work out a plan of action.But they warned that waiting too long to make de cisions would greatly reduce the chances of success.
A.Food production will increase,but not enough to feed all the people. |
B.The report was a result of a three - year study. |
C.Later on,more reports came out one by one. |
D.The world will be more crowded because the population will continue to grow. |
E.Experts believe enough food will be produced in developing countries very soon.
F.The experts say their picture of the earth for the year 2010 may be wrong.
G.Little increase is expected in South Asia,Africa and the Middle East.