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refractive index
n.
1.the ratio of the velocity of light in a vacuum to that in a medium
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refractive
refraction
refracting telescope
refractile
refract
reformulate
reformist
reformism
reformer
reformed
English Test
English Test question and answers to keep your language knowledge up-to-date.
refractiveness
refractivity
refractometer
refractoriness
refractory
refractory anaemia
refractory anemia
refractory period
refractory pot
refractory-lined
English Grammar Test
English Grammar Test is an application to help you enhance your English expertise.
fall from grace
trial balloon
jakob liebmann beer
rembrandt van rijn
evergreen grass
tamarind tree
edmund ironside
a-okay
kurchatovium
shelduck
Idiom of the Day
peg away (at something)
to keep working at something, to keep trying something
My friend has been pegging away at his job for many years now.
1.
When you are going to write an important letter like that, it is absolutely essential that you ________ all the facts first.
a.
connect
b.
join
c.
deliver
d.
assemble
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Fact
A blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.
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