With the world’s population estimated to grow from six to nine billion by 2050, researchers, businesses and governments are already dealing with the impact this increase will have on everything from food and water to infrastructure (基础设施) and jobs. Underlying all this (1) will be the demand for energy, which is expected to double over the next 40 years. Finding the resources to meet this demand in a (2) , sustainable way is the cornerstone (基石) of our nation’s energy security, and will be one of the major (3) of the 21st century. Alternative forms of energy—bio-fuels, wind and solar, to name a few—are (4) being funded and developed, and will play a growing (5) in the world’s energy supply. But experts say that even when (6) , alternative energy sources will likely meet only about 30% of the world’s energy needs by 2050. For example, even with (7) investments, such as the $93 million for wind energy. development (8) in the American Recovery and
Melbourne, with a population of over 3.5 million, is the second largest city in Australia. It is clean, safe, dynamic and exciting, and well known internationally for its universities and other educational institutions.
The city has well-planned tree-lined beautiful parks and gardens. It has a good transport system of roads, buses, trains, and trams (电车). The La Trobe University (拉特罗布大学) campus is connected to the Central Business District by trams, express buses, and bus and train connections.
Melbourne is a culturally rich city, and is home to large communities of people from all parts of Europe, the Americas, Africa, and Asia. The city is famous for its restaurants, theatres, music, opera, ballet, art, culture, and shops, and a lively and dynamic nightlife. Melbourne people are enthusiastic about sports, and the city hosts many famous international sports events. Near Melbourne there are beautiful coastlines with excellent beaches, national parks, forests, wine
A. hot
B. mild
C. dry
D. cold
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