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【单选题】
According to the passage, what were the beliefs of the Greek philosophers based upon?A.
How the natural world was described in Greek mythology.
B.
What they observed directly.
C.
The writings of philosophers from other societies.
D.
Measurements made with scientific instruments.
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【单选题】A:Good morning. What can I do for you? B: _________________________________________
A.
When do you want to fly?
B.
We have Flight 802 on Monday,
C.
Yes. I’d like to make a reservation to Boston next week.
D.
Let me check whether there’re seats available.
【简答题】由理想二极管构成的电路如图所示,电压U AB = 。
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