British scientists claimed that they developed in the first week of De – McqOptions

MCQOPTIONS

1.	British scientists claimed that they developed in the first week of December 2012, the first toothbrush of the world called Emmident toothbrush which makes use of the _________ for cleaning teeth. Fill in the blank with appropriate word:
A.	X-Ray
B.	Ultrasound waves
C.	3D Imaging
D.	None of these
Answer» C. 3D Imaging

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