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【单选题】
当设计无要求时,大体积混凝土内外温差一般应控制在( )以内A.
20℃
B.
25℃
C.
30℃
D.
35℃
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【简答题】Beijing, the Capital of China, has now ________________. (a large population, large populations)
【简答题】如图，平行四边形ABCD中，E在AC上，AE=2EC，F在AB上，BF=2AF，如果△BEF的面积为2cm 2 ，则平行四边形ABCD的面积为（ ）。
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【单选题】Ever since Ming furniture went on exhibit in Beijing, there large crowds at the World Art Museum every day.
A.
was
B.
have been
C.
has been
D.
were
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