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
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
举一反三
- The electron microscope can provide vastly greater resolution than the light microscope.
- Never ___________ so many tall buildings before I went to college in a big city. A: do I see B: I see C: had I seen D: I had seen
- It is a fantastic landscape that we ______. A: never see B: did never see C: had never seen D: shall never see
- According to the passage, the young ______ the change. A: overlook B: understand C: discover D: are against
- Never before ____, so you are not a friend of mine. A: I saw you B: I have seen you C: have I seen you D: had I see you