Artificial quartz is produced
a
in Brazil
b
from tiny transistors
c
in an astonishing number of devices
d
with the help of thermionic valves
e
from natural crystals within steel cylinders
Explanation
Correct Option
eVideo Explanation
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Discussions (7)

DVictorybearer
4 years ago
From the passage:
In order to make artificial quart----a very small pieces of natural crystal imported from Brazil are placed in ... steel cylinders.
This makes E the best option to me
Well, if the right answer is 'D', please provide information to prove it

Wande
3 years ago
pls i think E is the correct ans cos D according to wat de passage said is wat quartz replace and this is because de thermonic valve are large

