[单项选择]A Ways to determine the age of a fossil B The identity of a fossil the woman found C A comparison of two shellfish fossils D Plans for a field trip to look for fossils

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[简答题]Our age is in many ways unique, full of events and phenomena which never occurred before and can never happen again. They distort our thinking, making us believe that what is true now will be true forever, though perhaps on a larger scale. Because we have annihilated distance on this planet, we imagine that we can do it once again. The facts are far otherwise, and we will see them clearly if we forget the present and turn our minds toward the past. To our ancestors, the vastness of the earth was a dominant fact controlling their thoughts and lives. In all earlier ages than ours, the world was wide indeed, and no man could ever see more than a tiny fraction of its immensity. A few hundred miles—a thousand, at the most—was infinity. Only a lifetime ago parents waved farewell to their emigrating children in the virtual certainty that they would never meet again. And now, within one incredible generation, all this has changed. Over the seas where Odysseus wandered for a

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[单项选择]Passage Two

Social customs and ways of behaving change. Things which were considered impolite many years ago are now acceptable. Just a few years ago, it was considered impolite behaviour for a man to smoke on the street. No man who thought of himself as being a gentleman would make a fool of himself by smoking when a lady was in a room.
Customs are also different from country to country. Does a man walk on the left or the right of a woman in your country Or doesn’t it matter What about table manner Should you use both hands when you are eating
The Americans and the British not only speak the same language but also share a large number of social customs. For example, in both America and England people shake hands when they meet each other for the first time. Also, most Englishmen will open a door for a woman or offer their seat to a wom
A. ugly
B. dishonest
C. impolite
D. shameful

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[简答题] age

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[单项选择]

{{B}}TEXT B{{/B}}

Among the many ways in which people communicate through speech, public speaking has probably received more study and attracted more attention than any other. Politicians campaigning for public office, sales-people presenting products, and preachers delivering sermons all depend upon this form of public communication. Even people who do not make speaking a part of their daily work are often asked to make public speeches: students at graduation, for instance, or members of churches, clubs, or other organizations. Nearly every-one speaks in public at some time or other, and those who perform the task well often become leaders.
There are many masons for speaking in public. A public speaker may hope to teach an audience about new ideas, for example, or provide information about some topic. Creating a good f
A. most of them have been trained as public speakers
B. such activities are prevalent in the society
C. most of them have to do it when they study at college
D. the passage does not mention the reason

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{{B}}TEXT E{{/B}}

As people age, their cells become less efficient and less able replace damaged components. At the same time their tissues stiffen, For example the lungs and the heart muscle expand less successfully, the blood vessels become increasingly rigid, and the ligaments and tendons tighten.
Few investigators would attribute such diverse effects to a single cause. Nevertheless, researchers have discovered that a process long known to discolor and toughen foods may also contribute to age-related impairment of both cells and tissues. That process is nonenzymatic glycosylation, whereby glucose becomes attached to proteins without the aid of enzymes. When enzymes attach glucose to proteins (enzymatic glycosylation), they do so at a specific site on a specific protein molecule for a specific purpose. In contrast, the nonenzymatic process adds glucose haphazardly to any of several sites along any available peptide chain wit
A. It paradoxically both helps and hinders the longevity of proteins in the human body.
B. It can be counteracted in part by increased ingestion of glucose-free foods.
C. It is exacerbated by increased enzymatic glycosylation.
D. It probably involves the nonenzymatic glycosylation of proteins.

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