Why is 2004 a special year? Because it is a Leap Year（闰年）! What's so special about that? Well, Leap Year happens only once every four years. And it has 366 days instead of the usual 365. In a Leap Year, we have 29 days in February, while in a usual year we have only 28 days.

　　Why do we have a Leap Year? We have a Leap Year so we can keep the calendar（日历）in step with the seasons. The calendar is a kind of clock for the whole year. But how long is a year? A calendar year is 365 days. However, a true year is actually 365 days, 5 hours, 48 minutes and 46 seconds long. That's the time it takes the earth to travel around the sun. So every four years we have one more day, and we put it at the end of February, the shortest month of a year. Then we have a Leap Year.

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A．There were 29 days in February. 1992.

B．Usually we have 365 days ill a year.

C．People who were born on February 29th are very lucky because they can have more birthdays than others.

D．The next Leap Year will be the year 2008.

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　　London in the seventeenth century was one of the most beautiful cities in Europe of the time. There 1 many important buildings and one or two famous theatres (剧院). There was also one large bridge 2 the river Thames. 3 , most of Londoners lived in 4 wood houses in the streets. There were 5 drains (下水道), so people 6 their dirty water and rubbish into the streets. It was 7 8 September 2nd 1666, at about three o'clock in the morning, a 9 suddenly started in a shop. There was a strong 10 and the fire went 11 from one street to 12 . The fire lasted for three 13 and destroyed 13,200 homes and many other important 14 . This was the 15 of the old city of London.

Always forgetting your long passwords(密码)? Worried about being hacked(被攻击)?All these worries will soon become history. Scientists have found that upper-casing(大写)your password can help you reduce the chance being hacked.
Usually passwords are six letters or more.However,50 percent of people choose a common word or simple key combination for their password. The most used passwords are 123456, abcdef and abc123. In fact, if your passwords are in lower-case(小写),it will be easily hacked by a hacker. According to a study, it only takes a hacker ten minutes to hack a six-letter password which is in lower-case, but if you make the letter in upper-case, it can take up to ten hours. So if you want to make your account much safer, you should make your password upper-case. Of course, you can also add numbers or symbols to your password. Most of the time a hacker’s computer has to work for 18 days to break a password, but if you choose a nine-letter password that includes numbers and symbols, it can take a hacher’s  computer 44,530 years to break it.
【小题1】Scientists have found that   your password is much safer for  
your account.

完形填空：先阅读短文，然后从文后每小题的四个选项中选出一个可以填入短文中相应空白处的正确答案。

　　London in the seventeenth century was one of the most beautiful cities in Europe of the time. There (1) many important buildings and one or two famous theatres(剧院). There was also one large bridge (2) the river Thames. (3) , most of Londoners lived in (4) wood houses in the streets. There were (5) drains(下水道), so people (6) their dirty water and rubbish into the streets. It was (7) . (8) September 2nd 1666, at about three o'clock in the morning, a (9) suddenly started in a shop. There was a strong (10) and the fire went (11) from one street to (12) . The fire lasted for three (13) and destroyed (毁坏)13,200 homes and many other important (14) . This was the (15) of the old city of London.

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