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【单选题】
三种受压杆如图所示，杆1、2、3的最大压应力分别为σ max1 、σ max2 、σ max3 ，下列结论中正确的是______。A.
σ max1 =σ max2 =σ max3
B.
σ max1 ＞σ max2 =σ max3
C.
σ max2 ＞σ max1 =σ max3
D.
σ max2 ＞σ max1 ＞σ max3
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【单选题】What is Sustainable World Travel?
A.
An energy-saving organization.
B.
A group of environmentalists.
C.
A travel agency.
D.
A group of local residents involved in making decisions about travel.
【单选题】What is sustainable architecture?
A.
architecture that uses traditional methods to build modern buildings
B.
architecture that tries not to harm the environment
C.
architecture that uses a lot of different materials
【简答题】Read the questions. Listen to the passage and write the answers to the questions. What is unusual about World Sustainable travel? What kind of people are likely to work at Sustainable World Travel. Wh...
【单选题】What is sustainable tourism?
A.
It makes a low impact on the enviroment and local culture.
B.
It generates income and employment.
C.
It creats an important source of tax revenue.
D.
It makes little influence on domestic tourist markets.
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