Swimming is very popular in summer. People like swimming in summer because water 1.m______ people feel cool. If you like swimming and swim in a wrong place, it may not be safe(安全的). Last summer, more than ten people died 2.w______ they were 3.e_______ themselves in the water, and 4.m______ of them were students. But some people are 5.s_____ not careful in swimming. They often think they swim so well that6.n_____ can happen to them in water. Summer is here again , if you go swimming in summer, don’t forget that better swimmers have died in 7.w______. They 8.d______ only because they were not 9.c______, not because they could not swim. So don’t get into water when you go swimming 10.y______, go with your teachers or your parents. If there are “No 11.S______” sign, don’t get into water, either. If you 12.r______ these, swimming will be safer.

Traffic rules help to keep order on the road. They also help to keep people s 96 　. The pedestrian (行人) has as many rules to follow as the d 97　 of a car. You should walk on the sidewalk (人行道) or at the side of the road. Always look c 98　 before you walk across the street. If you like r 99　 a bike, you shouldn’t be in the middle of the road or run t 100 red traffic lights. When you go somewhere with a friend by bike, don't look a 101 or talk. If you drive a car, you should drive s 102 at the traffic lights. You must always wear a seat belt (安全带). Without belts b 103 the driver and the passengers may be badly hurt in a sudden accident.

You may not need to take a bus or seldom take a bus, but take care if you have to t 104 to some interesting places in one. Get on or get off a bus only w 105 it comes to a stop . When it is full, don't try to get inside or you may fall off. Traffic rules are also called Road Safety rules.

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1.When does the train X504 leave Washington?

A. 9:00.   B. 9=30.   C. 10:00.   D. 10=30.

2.If you have to get to New York before 12=00, you'd better take ______.

A. X500   B. X501   C. X502    D. X503

3.Which of the following trains does not stop at BWI Airport?

A. X502.   B. X503.   C. X504.   D. X505.

4.If you want to go on weekends, you can NOT choose ______.

A. X501   B. X502   C. X503    D. X504

5.Which of the following is true according to the timetable?

A. You can have meals on most of the trains.

B. Most of the trains do not stop at Neward Int'l Airport.

C. You can't buy a ticket at the stations without reservation.

D. Nobody can get from Princeton Junction to Metropark on January 30.