单项选择题

The" smart grid" is a catchall phrase for the power grid of the future, with various test projects underway in Colorado, Massachusetts, New York, Illinois, and Hawaii. The idea is to make a system that will stop power surges from causing blackouts: It would create more energy, efficient power lines to carry electricity longer distances without losing voltage (current grids lose about 8 percent of power over distance). It would incorporate wind and solar energy into existing power grids. And it would let customers monitor the electricity they use in their homes, paying less for power consumed in off-hours.
All the following words can be used to describe the "smart grid", EXCEPT

A. more efficient.
B. greener.
C. consumer-friendly.
D. cheaper.

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单项选择题

The Intemet as the public has known it and used it for the last decade may not be the Interact for the future. The system is getting old and rickety( 快要散架的; 摇摇晃晃的) ,particularly for the volume of commerce it has to accommodate. The prophylactic(预防性的) software that was meant to protect the web is less effective. Like anything else that is used regularly whether it is a ear, a light bulb, or a PC, the Internet is going to have to be patched and upgraded more often now. It won’t work every hour of every day anymore. The paragraph is intended to tell the reader that

A. the Internet is working properly till now.
B. the Internet used now has many problems.
C. the Intemet has to deal with a lot of data.
D. the Internet is well protected by softwar

单项选择题

Right now, the climate scientists feel that if all humans shut off carbon emissions today, it will still glide up by about 1 degree centigrade: In the business, as-usual scenarios, Nicholas Stem says there’s a 50 percent chance we may go to 5 degrees centigrade. We know what the Earth was like 5 or 6 degrees centigrade colder. That was called the Ice Ages. Imagine a world 5 degrees warmer. The desert lines would be dramatically changed. The West is projected to be in drought conditions. And certain tipping points might be triggered. We can adapt to 1 or 2 degrees. More than that, there is no adaptation strategy. What would happen if the temperature went five degrees up

A. We would return to the Ice Ages.
B. There would be more humid areas.
C. The climate would be ary in the West.
D. We would adapt to the new climate well.

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