A _______ light is very bright and makes you unable to see properlyfor a short time.A
A. dizzying
B. dazzling
C. dying
D.smiling
A. dizzying
B. dazzling
C. dying
D.smiling
A hollow-cathode lamp is( )
A.a narrow-band light source B.a broad-band light source
C.a light detector D.not a light source
NASA can tell that vegetation is growing back because of_____.
A.a bright, white light that is reflected
B.little tiny trees that are growing
C.vegetable gardens that are planted
D.a light, pinkish view from space
Among the traffic lights, red light is placed_____.
A.at the bottom
B.in the middle
C.at the top
D.below the green light
The word "shine" in Paragraph 3 means "______".
A.do well
B.reflect light
C.look happy
D.produce light
How do you know that the oil pressure is a bit low?
A.The warning light flashes only when the car runs at fast speed.
B.The warning light flashes only when the car is slowing down.
C.The warning light flashes continuously.
D.The warning light flashes when the engine idles.
Among the traffic lights, red light is placed ______.
A.at the bottom
B.in the middle
C.at the top
D.below the green light
An analogy is ______.
A.the study of the universe
B.a Comparison
C.the study of light waves
D.the result of scientific investigation