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.

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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.

单项选择题

At schools fortunate enough to have them, interactive whiteboards are a blessing for educators struggling to engage a generation of students weaned on the Web. In the U. K. —where 70 percent of all primary and secondary classrooms have interactive whiteboards, compared with just 16 percent in the United States - students in those classrooms made the equivalent of five months’ additional progress in math. So far, the data on the efficacy (有效性，功效) of touchscreens in U. S. classrooms is inconclusive, but promising. Multiple recent studies suggest that the devices boost attendance rates and classroom participation. Ever since Dorchester School District 2 in Summerville, S. C. , installed 1,200 interactive boards in its classrooms, disciplinary incidents are way down. Students were bored before the touchscreens arrived, says Superintendent Joe Pye. Trips to the principal’s office are almost nonexistent now. Which of the following is true according to the passage

A. 16% of the primary and secondary classrooms have installed touchscreens in the U. K.
B. 16% of the primary and secondary classrooms have installed touchscreens in the US.
C. 16% of the primary and secondary classrooms have installed touchscreens in Dorchester School District 2.
D. 70% of the primary and secondary classrooms have installed touchscreens in the US