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搜题
【单选题】
真核细胞型微生物的特点不包括A.
都是单细胞生物
B.
有典型细胞核
C.
细胞浆中细胞器完整
D.
可在人工配制的培养基上生长繁殖
E.
有细胞的基本结构
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements is supported by the passage?
A.
A scientist's most difficult task is testing hypotheses.
B.
It is better to revise a hypothesis than to reject it.
C.
Theories are simply imaginary models of past events.
D.
A good scientist needs to be creative.
【单选题】(That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages.
A.
That
B.
but
C.
is
D.
was
【单选题】They didnt feel the least bit frustrated even when they were confronted with ______difficulties.
A.
grave
B.
fantastic
C.
temporary
D.
implicit
【简答题】下列各组物质中，前者属于纯净物、后者属于混合物的是（ ） A．氮气、蒸馏水 B．矿泉水、稀盐酸 C．牛奶、碳酸钙 D．二氧化碳、空气
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