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吊装预制混凝土构件时，起重吊索与构件水平面的夹角不应小于：( )

A.45°
B.30°
C.15°
D.60°
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A、
B、
C、
D、
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Eight years ago, officials in Chicago, Illinois, decided to replace the black roof on the city government building with a planted garden. The aim was to reduce energy costs, improve air quality and control the rainwater entering the city’s waste system（系统）．Green roofs also help reduce a problem called urban heat islands（城市热岛现象）．During hot weather, the building’s root could reach temperatures of up to 76℃. With the garden, the temperature of the root area was reduced by at least 30℃. Workers planted over 150 kinds of plants that could stand bad weather. Now the area is cooler, the building requires less energy to keep cool, and the roof looks nice. Chicago also offers money to help people pay for building their own green roots.
About five years ago, officials in Thane, India, decided to reduce the city’s depending on power from coal. The city often experiences lack of power because of the large numbers of people using electricity. Officials decided to save energy by putting water heaters（热水器）powered by the sun on top of the city’s main hospital. The hospital saved thousands of dollars in energy costs each year. Officials then began building this kind of water heater around the city.
China has announced plans to build a city called Dongtan. The company designing the city says it will produce its energy from the wind, sun and waste. The aim is for the city to be an example to the rest of China.
What does the author try to tell the readers about?（　　）
A.Problemsinbigcitiesoftheworld
B.Therisingenergycostsincities
C.Differentwaysofgoinggreen
D.Energyproblemsintheworld
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按照土地使用权出让合同约定的动工开发期限为2002年9月，如果该房产商逾期未动工开发，政府可以在何时无偿收回土地使用权？( )
A.2003年9月
B.2004年9月
C.2005年9月
D.2007年9月
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