What made it possible for the American women to have the custom of wearing lace veils at weddings？
A. The increased appreciation of lace.
B. The importation of lace.
C. The invention of the lace making machine.
D. The importation of lace making machines.
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Whats the main task for "Deep Impact" this time？
A. To visit other planets.
B. To destroy the comet.
C. To collect scientific data.
D. To test the possibility of unmanned spaceship.
下面那些影响光纤的衰减()
A信号强度
B线路衰减
C接收机灵敏度
D中心频率
E插入损耗
What can we know according to the passage？
A. Great glaciers are very destructive.
B. All glaciers move southward.
C. The Mississippi-Missouri-Ohio system is larger than it was before the Ice Age.
D. The Great Lakes are now smaller than they were before the Ice Age.
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