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问题 单项选择题

属于城市用地评定的三类用地要求的是( )。 ①地基承载力小于60kPa和厚度在2 m以上的泥炭层或流砂层，需要采取很复杂的人工地基和加固措施； ②地形坡度超过20%以上，布置建筑物很困难； ③有严重的活动性冲沟、滑坡等不良地质现象，采取防治措施需花费很大工程量和工程费用； ④有轻微的活动性冲沟、滑坡等不良地质现象，需要采取一定工程准备措施等； ⑤属洪水轻度淹没区，淹没深度不超过1～1.5 m，需采取防洪措施。

A．①②③④⑤

B．①②④

C．①③④

D．①②③

答案

参考答案：D

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. \

What will Hawkins do when he sees something interesting on a road trip

A．He will turn back.

B．He will drive around.

C．He will stop to explore.

D．He will stop explorin
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单项选择题

生物反应调节剂的定义是（）。

A.直接增强宿主抗肿瘤的反应

B.通过减少抑制性机制而间接增强了宿主对肿瘤的免疫反应

C.增强宿主对细胞毒物质造成损伤的耐受能力

D.预防或逆转细胞转化，或促进不成熟肿瘤细胞的成熟

E.以上具备任一条件即可
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