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【单选题】
如图，已知AA 1 与BB 1 是异面直线，且AA 1 =2，BB 1 =1，AB⊥BB 1 ，A 1 B 1 ⊥BB 1 ，则AA 1 与BB 1 所成的角为（ ）A.
30°
B.
45°
C.
60°
D.
90°
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【简答题】Procrastination are people who have a chronic habit of putting things off, usually until the last minute and sometimes until it is too late altogether. The most 1 reason that procrastinators themselve...
【单选题】It can be inferred from the passage that ______.
A.
the energy crisis is similar to the natural disasters we had in the past
B.
the problem of energy is the most serious problem our country is confronted with
C.
the author is uninterested in the problems of our society
D.
the author is particularly worried about the crises we are facing
【简答题】阅读理解。 An apple a day keeps the doctor away. Well, milk may work in the same way！ Milk is the natural food for mammalian (哺乳动物) babies. It helps them grow strong because it is rich in protein (蛋白质),ca...
【单选题】It is implied in the text it is hard to______．
A.
carry life learning through
B.
tell the nature of life learning
C.
learn without going to school
D.
find a specially trained teacher
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