某放大电路在负载开路时的输出电压为6 V，当接人2 kΩ负载后，其输出电压降为4 V，这表明该放大电路的输出电阻为_________。
A. 10 kΩ
B. 2 kΩ
C. 1 kΩ
D. 0．5 kΩ
查看答案
【C4】
A. like
B. about
C. as
D. on
The most useful information Michael Mann could directly see from the drill cores should be
A. how Hurricane Katrina had disturbed the sediments.
B. how often hurricanes occurred over the past 1500 years.
C. how many times hurricanes had occurred in the last 1500 years.
D. how water temperatures had changed in the last 1500 years.
【C12】
A. though
B. for
C. but
D. while
听力原文：M: What would you like to see first, the monkeys or the camels？
W: I'd really like to see the deer. It's almost their feeding time.
Q: Where are the speakers？
(3)
At a zoo.
B. In a cafeteria.
C. On a college campus.
D. At an art museum.
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