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【单选题】
I _____ a computer.Jim ________ a computer,tooA.
have;have
B.
has;have
C.
have ;has
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【简答题】交流电每秒钟周期性变化的次数叫（），用字母（）表示，其单位名称是（），单位符号用（）表示。
【多选题】What has contributed to Oprah’s success?
A.
Her persistence.
B.
Her determination.
C.
Her father’s education.
D.
Her courage when confronting difficulties.
【单选题】What has contributed to the rapid economic growth in China and India?______.
A.
Copying western-style. economic behavior
B.
Heavy reliance on the hand of government
C.
Timely reform. of government at all levels
D.
Free market plus government intervention
【单选题】What has contributed much to America's lack of qualified skilled workers?
A.
The outdated education system.
B.
The current new classification of workforce.
C.
The fact that most American workers are illiterates.
D.
The fact that the blue-collar workers are not used to the factory work.
【简答题】交流电每秒种周期性变化次数叫（）用字母（）表示，它的单位是（）。
【简答题】交流电的周期用字母____表示,单位是____。
【简答题】交流电在单位时间内(1秒)完成周期性变化的次数叫做_____;完成一次周期性变化所用的时间叫做_____。周期用字母_____表示,单位是____。频率用字母____表示,单位____。
【简答题】What has contributed to the current wave of globalization?
【简答题】What has contributed to the growth of advertising industry?
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