Which of the following has NOT been affected by the heavy snow?
A. Washington Dc.
B. New York.
C. Boston.
D. Los Angeles.
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Which of the following is NOT the most affected area by the H1N1 virus?
A. Southeast.
B. Great Lake.
C. West.
D. North.
NASA would have to settle the financial matter by
A. loaning money from the state bank.
B. cooperating with private enterprises.
C. resorting to commercial banks.
D. intensifying structural adjustment.
Why it is unrealistic to send astronauts back to the moon now?
A. Because the White House warned them not to do now.
Because the panel of experts objected the proposals.
C. Because the space agency didn"t allocate adequate money.
D. Because it would take too much money to fulfill it.
风能利用存在一些限制及弊端()。
A风速不稳定,产生的能量大小不稳定
B风能利用受地理位置限制严重
C风能的转换效率低
D风能是新型能源,相应的使用设备也不是很成熟