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【单选题】
指出能替换句中划线部分的选项。 Jane's new friends are very friendly to her. [ ]A.
kind
B.
glad
C.
happy
D.
helpful
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举一反三
【单选题】What did the North of the United States begin to develop in the nineteenth century?
A.
Industry and business
B.
Technology and transportation
C.
Agriculture and forestry
D.
Manufacture and handicraft
【判断题】非周期、连续时间信号具有连续、非周期频谱； 周期、连续时间信号具有离散、非周期频谱； 非周期、离散时间信号具有连续、周期频谱； 周期、离散时间信号具有离散。周期频谱； 可见，信号的时域周期性对应频域的连续性，时域连续性对应频域的周期性。
A.
正确
B.
错误
【单选题】What did the researchers at Duke University in North Carolina say?
A.
Humans need more sleep than other mammals.
B.
Humans need less sleep than other mammals.
C.
Humans need as much sleep as other mammals.
D.
Humans have developed sleeping habits recently.
【简答题】What did William do after he suppressed the Saxon risings in the north?
【单选题】Singing Alarms Could Save the Blind If you cannot see, you may not be able to find your way out of a burning building-and that could be fatal. A company in Leeds could(51)all that with directional (定向...
A.
change
B.
cure
C.
demand
D.
set
【单选题】What did scientists claim several months after Gore returned from the North Pole?
A.
In many land areas spring snowmelt is advanced year by year.
B.
The north polar cap has thinned by 2 percent in the last decade.
C.
Dramatic changes in the pattern of ice distribution have taken place in the North Pole.
D.
The temperature of the tundra below the Arctic Circle has dramatically dropped.
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