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【单选题】
一般大型苗圃指的是 ( )公顷以上。A.
30
B.
20
C.
25
D.
10
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举一反三
【简答题】根据短文内容，从下面表格中选择正确的选项填入横线空格处。 A. Scientists are still working on testing them. B. So some clever farmers have solved (解决) the watermelon problem. C. Doctors might be able to use vegetables to fight can...
【单选题】(2013·青岛一模)Scientists are still wondering ________ the Egyptians built the pyramids so long ago.
A.
how it is that
B.
how is it that
C.
it is how that
D.
that how it is
【简答题】机械图样中,图形仅表达机件的( ),要确定机械的大小,需要( )。
【单选题】The UFO phenomenon is not new to us, but scientists are still not able to offer any______ explanations.
A.
specific
B.
rational
C.
virtual
D.
literal
【多选题】以下哪几句为描写昔日汴京过元宵节的场景?
A.
落日熔金，暮云合壁，人在何处。
B.
元宵佳节，融和天气，次第岂无风雨。
C.
中州盛日，闺门多暇，记得偏重三五。
D.
铺翠冠儿，捻金雪柳，簇带争济楚。
【简答题】【C1】______ nearly a hundred years of powered flight, scientists are still trying to figure out how birds fly. Researchers have learned that the slapping noise pigeons make when they suddenly take off ...
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