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【单选题】
下面的电气符号表示的是A.
普通二极管
B.
稳压二极管
C.
发光二极管
D.
光电二极管
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【单选题】Between 1977 and 1981, three groups of American women, numbering 27 in all, between the ages of 35 and 65, were given month-long tests to determine how would they respond to conditions resembling thos...
A.
High resistance to radiation.
B.
Unusual strength.
C.
Low food intake.
D.
Low oxygen intake.
【单选题】How many food groups are mentioned in the Food Guide Pyramid?
A.
Four
B.
Five
C.
Six
D.
Eight
【单选题】听力原文： Animals do many different, amazing things to get through the winter. Some of them travel to other places where the weather is warmer or they can find food. Many birds travel in the fall. (32) Be...
A.
Because the destination is very far.
B.
Because they can keep warm.
C.
Because the trip is very dangerous.
D.
Because the trip is very lonely.
【单选题】Between 1977 and 1981, three groups of American women, numbering 27 in all, between the ages of 35 and 65, were given month-long tests to determine how would they respond to conditions resembling thos...
A.
conditioning
B.
virtue
C.
zero gravity
D.
food and oxygen
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