题目内容
根据短文内容,从短文后的七个选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。
Leap Year
Leap year is a year that has 366 days instead of the usual 365.It normally occurs every four years, always on an even-numbered year.The extra day is added to our shortest month.That is the second month of the year, which in non-leap years has 28 days, two fewer that any other month. 1.
Leap year is also called the bissextile year. 2. In our calendar system there is a need for a leap year because the solar year (the time it takes the earth to go around the sun once) is actually slightly more than 365 days long.That extra day—Feb.29 every four years—helps correct the difference between our calendar and the solar calendar.
Leap year was first made part of the calendar by the ancient Roman leader Julius Caesar.His astronomers had calculated the length of the solar year to be 365 days and six hours.So Caesar declared that an extra day be added to the calendar. 3.
Caesar's adjustment, however, was not entirely accurate because his astronomers' year exceeded the true solar year by eleven minutes and fourteen seconds.By 1582, a difference of ten days had developed between the calendar year and the true solar year.To correct this error, Pope Gregory XIII ruled that every fourth year would continue to be a leap year except for century years that could not be divided evenly by 400.By this system, century years such as 1700, 1800, and 1900 were not leap years, but the year 2000 was a leap year. 4.
Persons born on Feb.29 celebrate their growing up a little differently from the rest of us. 5. But if they go strictly by the calendar, they have only one-fourth as many birthday celebrations as most people.
A.This is done every four years.
B.This is its formal, or scientific title.
C.This may seem complicated, but it works.
D.They acknowledge that they get older each year.
E.The leap year was introduced in the Julian calendar in 46 BC.
F.When you see Feb.29 on a calendar, you know that year is a leap year.
G.In a leap year, the extra day is added to the second month, giving it 29 instead of the usual 28 days
1.F
2.B
3.A
4.C
5.D
【解析】略

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.