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【单选题】
利用药物和杂质在物理性质上的差异进行特殊杂质的检查, 不属于 此法的检查方法是A.
旋光性的差异
B.
杂质与一定试剂反应生产气体
C.
臭、味及挥发性的差异
D.
吸附或分配性质的差异
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举一反三
【单选题】Which of the following statements about the 55 men framing the Constitution is true?
A.
Thomas Jefferson was not among them.
B.
All of them were famous.
C.
All of them contributed much to the framing
D.
George Washington and Benjamin Franklin were among them.
【单选题】Every year lots of trees _______ to make our country more beautiful.
A.
is planted
B.
was planted
C.
are planted
D.
were planted
【判断题】The American Constitution is the first written constitution in the modern world.
A.
正确
B.
错误
【单选题】— Do you plant trees in spring? —Yes. Many trees in our city every year. [ ]
A.
are planting
B.
are planted
C.
were planted
【简答题】短文填词。根据首字母提示，完成短文。 Have you ever p 1 a few trees on Tree Planting Day? Each year, millions of people, both old and young, men and women, plant a lot of trees. But this may not be the best way to make ...
【单选题】Many trees _______ on the hills last year. And we will plant more this year.
A.
plant
B.
planted
C.
are planted
D.
were planted
【单选题】Many of today ’ s superstitions (迷信) are based on old beliefs (信念) . K nocking on the wood for good luck comes from the old idea that spirits (精灵) lived in trees. B reaking a mirror is bad luck becaus...
A.
B reaking a mirror is bad luck because people once thought that reflections were part of a person ’ s spirit.
B.
Many of today ’ s superstitions （迷信） are based on old beliefs （信念） .
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