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
D
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
内容
- 0
According to the passage, scientists have discovered that influenza viruses ______ . A: cause ill health in wild birds B: do not always cause symptoms in birds C: are rarely present in wild birds D: change when transferred from animals to man
- 1
——Do you like the movie Harry Potter?<br/>——Sorry. I ____ that movie. A: never saw B: never see C: had never seen D: have never seen
- 2
The resolution of a light microscope is() A: 2.0nm B: 0.2nm C: 0.2μm D: 2.0μm E: 5.0 nm
- 3
The witness told the court that he _____ the accused before. A: had never seen B: had ever seen C: hasn't seen D: didn't see
- 4
Nowhere else in the world ______ more beautiful scenery than in Switzerland. A: you can see B: you had seen C: can you see D: had you seen