单项选择题

Costa Rica is insisting that economic growth and environmentalism work together. It has created a holistic(整体的，全面的)strategy to think about growth, one that demands that everything gets counted. So if a chemical factory sells tons of fertilizer but pollutes a river - or a farm sells bananas but destroys a carbon - absorbing and species - preserving forest - this is not honest growth. You have to pay for using nature. It is called "payment for environmental services"—nobody gets to treat climate, water, fish and forests as free anymore.
The process began in the 1990s when Costa Rica, which sits at the intersection of two continents and two oceans, came to fully appreciate its incredible gift of biodiversity - and that its economic future lay in protecting it. So it did something no country has ever done: It put energy, environment, mines and water all under one minister.
Costa Rica started to protect the environment

A. when it came to realize the importance of biodiversity in the 1990s.
B. after its environment had been severely destroyed in the 1990s.
C. before it had created a holistic strategy to think about growth.
D. when the economy started to grow fast at the expense of environment.

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单项选择题

The Great Depression of the 1930s was the most momentous(重大的，重要的) economic event of the 20th century. It was a direct cause of World War II, having fed the Nazis’rise in Germany. It inspired a new American welfare system as a response to mass misery. Everywhere, it discredited unsupervised capitalism. Given today’s economic crisis, our renewed fascination with the Depression is natural. But we ought to be cautious in stretching the parallels too far. Why was the Great Depression of the 1930s the most momentous event in the 20’h century

A. It had far - reaching impact on many aspects of the world.
B. It restructured the social and political systems in many countries.
C. It reordered the military powers in the world.
D. Its effect has stretched all the way to today.

单项选择题

In Boulder, Colo. , a surge of electricity on the power grid can largely go unhoticed. The grid is monitored electronically, so that if there are any sudden rushes or fallen power lines, electricity is automatically rerouted(使改变路线) from one part of the system to another. This pilot project sounds simple enough—maybe even a little obvious. But this new type of technology could have prevented the 2003 blackout that knocked out power to much of the Northeastern United States. On that August day’a few sagging power lines brushed against some trees, and the lines shut down. This set off a domino effect, as ome part of the grid taxed another. The result By the end of that humid evening, 50 million people in eight states and southeastern Canada were left without power. What will happen if there are fallen power lines in -,in electrically monitored grid

A. A blackout will follow.
B. Electricity will transmit through another grid.
C. The power failure will go almost unnoticed.
D. Workers must go to site to restore electricity.