题目内容
A very rapid increase in the number of ships sailing between American and European ports began almost immediately after the end of the war of 1812 in order to meet the new need for the regular rapid transportation of mail, light cargo, and passengers. It was the increase in emigration to America that for the first time made the carrying of passengers across the Atlantic more profitable than the transportation of heavy cargo. A new type of sailing vessel, the packet, appeared to meet this new demand, and the extent of the demand very soon resulted in strong competition among several packet lines. The earliest to these was the Black Ball Line established in New York in 1816, only a year after the end of the war. The scheduled service of this famous line started with four of the new fast packets, each of 400 to 500 tons: the Pacific, the Amity, the James Cooper, and the William Thompson. During the first twenty years of service, the average time from New York to Liverpool was 23 days and the average trip back to New York took 40 days.By the middle of the century, packets had increased in size to between 900 and 1,000 tons, and their speed had increased. The Red Jacket once sailed from New York to Liverpool in 13 days, 11.5 hours. The Mary Whiteridge took 4.5 hours off this record on a run from Baltimore to Liverpool. Such speeds were far greater than the average of from 19 to 21 days to Liverpool and from 30 to 35 homeward to New York, but the packet had still set a new standard for transoceanic travel. No wonder that steamships, the first of which tried to compete with the packets in 1838, only began to replace them in the 1850's.
The fastest transatlantic voyage by a packet mentioned by the author was from ______.
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Few people experience this type of lifelong relationship or sense of community togetherness now. The American society is much more unsettled now; people often move from neighborhood to neighborhood, city to city, and coast to coast. It is rare to find people who have lived all their lives in one community. Because people move so frequently, they do not have a chance to get to know their neighbors. Perhaps this is also why Americans tend to have a more casual attitude about friendships than people from some other cultures; Americans are accustomed to leaving friends and making new friends. In such an impersonal society, people have lost the habit of saying hello to people they pass on the streets or in the hallways of their apartment buildings.
What is described in the first paragraph？
The stubborn young man did not follow the advice that he ______ on his behavior. since he
In the year 2000, the world is going to have a population of about 8 billion. Most scientists agree that the most severe problem is food supply.
Who is going to feed all these people？ Where is the food going to come from？ Are we going to have enough food？ Are we going to produce more artificial foods？
One way of improving the situation is for people to eat less meat. Why？ Because it takes 4 kilos of grain protein (蛋白质) to produce half a kilo of meat protein.Clearly, there is not going to be sufficient meat protein for 8 billion people. Therefore, it will also be necessary to change eating habits because meat is the main part of many people's food today.
A possible solution to this latter problem is the soybean (大豆). The soybean plant produces beans which have a very high fat and protein content. Scientists can now make these look and taste like real meat. They can also make many other artificial products such as soybean milk, for example, which has a taste of milk and can be used in cooking in very much the same ways as cow's milk. In fact, one woman in the United States fed her family only on soybeans for a year! She gave them soybean beef, soybean chicken, soybean mi]k, and sometimes just soybeans. Possibly, we are all going to eat soybeans in the future and finally give up meat completely from our tables.
What is the main subject of the passage？
It is economically essential to make sure that this entire shipment of new ears ______ to
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