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发布时间: 1970-01-01

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1最佳选择题 3分

WhydidittakesolongtodeveloptheX-raymicroscope

  • A. Funds for research were insufficient.
  • B. The source of illumination was not bright enough until recently.
  • C. Materials used to manufacture X-ray tubes were difficult to obtain.
  • D. X-ray microscopes were too complicated to operate.
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本题解析: 暂无解析

2最佳选择题 3分

Accordingtothepassagetheinventionofthevisible-ligh

  • 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
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本题解析: 暂无解析

3最佳选择题 3分

Whydoestheauthormentionthevisible-lightmicroscopei

  • A. To begin a discussion, of sixteenth-century discoveries.
  • B. To put the X-ray microscope in a historical perspective.
  • C. To show how limited its uses are.
  • D. To explain how it functioned.
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4最佳选择题 3分

Whatdoesthepassagemainlydiscuss

  • A. The detail seen through a microscope.
  • B. Sources of illumination for microscopes.
  • C. A new kind of microscope.
  • D. Outdated microscopic techniques.
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5最佳选择题 3分

Basedontheinformationinthepassagewhatcanbeinferred

  • A. They will probably replace electron microscopes altogether.
  • B. They will eventually he much cheaper to produce than they are now.
  • C. They will provide information not available from other kinds of microscopes.
  • D. They will eventually change the illumination range that they now use.
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本题解析: 暂无解析

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