A．was the new explosiveB．the new explosive wasC．was new explosiveD．new explosive was
A. was the new explosive
B. the new explosive was
C. was new explosive
D. new explosive was
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The analogy drawn between the earth and a spaceship is to illustrate the idea of ______ on
A. unlimited resources
B. limited resources
C. recycling
D. regeneration
A．in chanceB．accidentallyC．by incidentD．unbelievably
A. in chance
B. accidentally
C. by incident
D. unbelievably
A．alsoB．andC．as wellD．as well as
A. also
B. and
C. as well
D. as well as
According to the passage, the invention of the visible-light microscope allowed scientists
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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