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【单选题】
Which of the following statements about deer populations is supported by the information in paragraph 4?A.
Deer populations reached their highest point during the 1940s and then began to decline.
B.
The activities of settlers contributed in unexpected ways to the growth of some deer populations in later times.
C.
The clearing of wilderness land for construction caused biotic changes from which the black-tailed deer population has never recovered.
D.
Since the 1940s the winter populations of deer have fluctuated more than the summer populations have.
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【单选题】The first compass, called a sinan, was invented __________.
A.
in the Han Dynasty
B.
in the Western Zhou Dynasty
C.
in the Shang Dynasty
D.
during the Warring States Period
【单选题】According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ( ) during the Warring States Period.
A.
Si Nan
B.
wet compass
C.
dry compass
D.
navy compass
【单选题】What was the purpose when the magnetic compass was first invented?
A.
Divination.
B.
Navigation.
C.
Enjoyment.
D.
War.
【单选题】According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ( ) during the Warring States Period.
A.
wet compass
B.
Si Nan
C.
dry compass
D.
navy compass
【单选题】According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ____during the Warring States Period.
A.
Si Nan
B.
navy compass
C.
wet compass
D.
dry compass
【简答题】为80C51单片机扩展行列式按键，1个并行口最多可以扩展______个按键。
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