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问题 单项选择题

机械加压送风防烟楼梯间应保持余压，余压范围为（）PA。

A、25~30

B、30~40

C、40~50

D、50~60

答案

参考答案：C

单项选择题

期中偿还债券是指债券在偿还期满之前由债务人采取在交易市场上购回债券或者直接向债券持有人支付本金的方式进行本金的偿还。期中偿还债券还可以分为（）。

A.定时偿还

B.展期偿还

C.随时偿还

D.买入偿还
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单项选择题

第1篇 Road Trip Vacations


It’s summer. In the United States, it’s the season of swimming pools, barbeques, camping and road trips.
Road trip vacations where the car journey is part of the fun are especially popular with college students, who like to explore the country on wheels. These budget trips are ideal for students who often have plenty of free time but little money.
"Ever since I went to college, I’ve been traveling around a lot, exploring the country," said Austin Hawkins, a 19-year-old college student from New York. This summer, Hawkins and his friends have spent weekends traveling in New England.
The best part about car trips, said Hawkins, is that you can be spontaneous. "On a road trip, if you get interested in things you see along the way you can stop and explore. "
Matt Roberts, a 20-year-old student from Ohio who drove to Montreal, Canada, agrees. "With road trips you don’t have to plan in advance, you can just get into a car and drive. "
Even with high gas prices, driving with friends is cheaper than flying. Roberts paid about 40 dollars for gas, but a round trip plane ticket would have cost nearly 400 dollars.
Driving trips first became popular in the 1920s. Newly paved roads and improved cars made it possible to travel longer distances. Motels started appearing outside cities.
By the 1950s, car ownership became the norm. Construction of the US interstate highway system began in 1956 and motel and restaurant chains popped up everywhere making long distance trips easier.
Today, the US has the highest car ownership rate in the world. Only 8 percent of American homes have no car, according to the most recent US census.
Though many college students don’t own a car, most have access to one. On many of Hawkins’ trips, they used a borrowed van.
Hawkins’ most memorable road trip took place over spring break. He and two friends drove from New York to New Orleans to volunteer, helping rebuild the city after Hurricane Katrina hit it last July. They crossed the country in two days and slept in their car in church parking lots.
Roberts’ road trip to Canada last winter was even more eventful. Upon arriving in Montreal, they were lost in a blizzard and shivering in the -25~cold. To find their hotel, they turned on a laptop and drove around in circles until they found a spot with wireless Internet coverage.
"I know we should have planned better, but we’re young. Now, when I see those guys I always say: ’Remember when we were lost in the snow storm! ’ I’ll never forget that. \

Which of the following words can best describe Hawkins’ trip to New Orleans

A．Eventful.

B．Colourful.

C．Delightful.

D．Unforgettabl
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