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【单选题】
劣等商品的价格下降而其他情况不变的时候A.
替代效应和收入效应相互加强，导致该商品的需求量增加
B.
替代效应和收入效应相互加强，导致该商品的需求量减少
C.
替代效应倾向于增加该商品的需求量，而收入效应倾向于减少其需求量
D.
替代效应倾向于减少该商品的需求量，而收入效应倾向于增加其需求量
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举一反三
【单选题】According to the passage, the invention of the visible-light microscope allowed scientists to ______.
A.
see viruses directly
B.
develop the electron microscope later on
C.
understand more about the distribution of the chemical elements
D.
discover single-celled plants anal animals they had never seen before
【单选题】管状器官的管壁结构由内向外依次是
A.
上皮、固有膜、黏膜肌层和外膜
B.
上皮、固有膜、肌层和外膜
C.
上皮、黏膜下层、肌层和外膜
D.
黏膜、同有膜、肌层和外膜
E.
黏膜、黏膜下层、肌层和外膜
【单选题】To observe the growth of mouse cells in culture bottles, which kind microscope is best?
A.
Bright field microscope
B.
Phase contrast-microscope
C.
Fluorescent microscope
【单选题】Which microscope does not rely on visible light?
A.
Simple microscope
B.
Compound microscope
C.
Phase contrast microscope
D.
Dissection microscope
E.
Transmission electron microscope
【单选题】It is difficult to discern the sample that is on the slide unless the microscope is adjusted.
A.
discard
B.
arrange
C.
determine
D.
disagreement
【单选题】The microscope enables scientists to distinguish an incredible number and variety of bacteria.
A.
unavoidable
B.
unchangeable
C.
unbelievable
D.
unpredictable
【简答题】What is a microscope used for?
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