Passage 2

　　Scattered through the seas of the world are billions of tons of small plants and animals called plankton (浮游生物). Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for many larger animals.

　　Plankton has been described as the equivalent (相等物) of the grasses that grow on the dry land continents, and the comparison is an appropriate one. In potential food value, however, plankton far outweighs that of the land grasses. One scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohydrates (碳水化合物) each year, the sea’s plankton generates more than twice as much.

　　Despite its enormous food potential, little effort was made until recently to farm plankton as we farm grasses on land. Now, marine scientists have at last begun to study this possibility, especially as the sea’s resources loom even more important as a means of feeding an expanding world population.

　　No one yet has seriously suggested that “plankton-burgers” may soon become popular around the world. As a possible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.

　　One type of plankton that seems to have great harvest possibilities is a tiny shrimp-like creature called krill (磷虾). Growing to two or three inches long, krill provide the major food for the giant blue whale, the largest animal ever to inhabit the Earth. Realizing that this whale may grow to 100 feet and weigh 150 tons at maturity, it is not surprising that each one devours more than one ton of krill daily.

　　Krill swim about just below the surface in huge schools sometimes miles wide, mainly in the cold Antarctic. Because of their pink color, they often appear as a solid reddish mass when viewed from a ship or from the air. Krill are very high in food value. A pound of these crustaceans contains about 460 calories—about the same as shrimp or lobster, to which they are related.

　　If the krill can feed such huge creatures as whales, many scientists reason, they must certainly be contenders as a new food source for humans.

　　51．Which of the following statements best describes the organization of the passage?

　　A．The author presents the advantages and disadvantages of plankton as a food source.

　　B．The author quotes public opinion to support the argument for farming plankton.

　　C．The author makes a general statement about plankton as a food source and then moves to a specific example.

　　D．The author introduces two kinds of sea food: plankton and krill

　　52．Which of the following is NOT true about plankton?

　　A．It refers to forms of organic life that drift in or float on the waters of oceans or rivers.

　　B．It refers to grasses and the like that grow at the bottom of the ocean.

　　C．It refers to small plants and animals that provide a basic food for many larger animals.

　　D．It is scattered through the seas of the world.

　　53．According to the passage, plankton is considered to be more valuable than land grasses, because_____.

　　A．it is more tasty

　　B．it produces more carbohydrates

　　C．it is easier to cultivate

　　D．The quality of it is much more than the land grass

　　54．Marine scientists have begun to study the possibility of farming plankton because_____.

　　A．they are encouraged by the former efforts made about it

　　B．the sea resources appear more important as a means of feeding an expanding world population

　　C．plankton can be fertilizers to grasses

　　D．It is easier to cultivate plankton than land grass

　　55．When the author mentions “plankton-burgers” in Paragraph 4, he wants_____.

　　A．to describe the appearance of one type of plankton

　　B．to illustrate how many planktons a whale consumes

　　C．to suggest plankton as a possible food source

　　D．to illustrate that the plankton is very delicious

　　Ⅴ.词形转换。将括号里提供的词转换成适当的词形填入答题纸上相应的位置。（本大题共10小题，每小题1分，共10分）

　　Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets. (10 points)

　　56．Since the party is very informal, whether you wear the red dress or the blue dress is really_______.(important)

　　57．More than any other single_______, writing has transformed human consciousness.(invent)

　　58．When he refused to talk, the soldiers_______ to kill him. (threat)

　　59．Fishing and mountain-climbing are his favorite _______.(relax)

　　60．The policeman’s _______ was to discover the murderer. (assign)

　　61．This _______ exercise is a good test of your student’s competence. (challenge)

　　62．They have been through a lot together in their fifty years of _______. (marry)

　　63．The weather _______ greatly from morning till night in that area. (variable)

　　64．It’s just a casual occasion, so it’ll be all right if you dress_______. (formal)

　　65．In carrying out a successful lesson, a teacher needs the students’ _______. (cooperative)

　　Ⅵ.句子翻译。将下列句子译成英语，译文写在答题纸上相应的位置。如括号内有特定要求，请按要求答题。（本大题共5小题，每小题3分，共15分）

　　Translate the following sentences into English. (15 points)

　　66．在中国，城市家庭只允许生一个孩子。

　　67．随着劳动力市场的竞争日趋激烈，许多人不再把他们目前的工作看成是理所当然的了。

　　68．他从一生的经历中体会到，友谊和爱比金钱重要的多。

　　69．他感到他从工作中所得到的与所投入的不相称。

　　70．为了减少污染，他从不在等候的时间里让自己的汽车引擎开着。

　　Ⅶ.作文。根据所学的一篇课文，在答题纸相应的位置上写出150字左右的短文。（本大题要求写成短文形式，本大题15分）

　　Write a short composition of about 150 words based on one of the texts you have learned.

　　71. Topic:“Heroes inspire respect, celebrities inspire envy.”

　　The text you should base your composition on is “Icons”.