单项选择题

Which of the following matches of chief city and the state it belongs to is NOT correct

A. Chicago--Illinois
B. Philadelphia--Pennsylvania
C. San Francisco--Utah
D. Houston--Texas
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单项选择题
In the next decade, Robots will become practical because of all but one exception that ______.
A．they may cook hamburgers in the restaurants
B．they can perform wonderous skill as shown in science fiction film
C．they may deliver meal trays in hospitals
D．they may do some moppings in the shopping center
单项选择题
Mir’s two primary sources of oxygen have stopped working and now ______ of oxygen inside Mir’s cabin.
A．there is little supply
B．there is still enough supply
C．there is several days’ supply
D．there is only two days’ supply
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