Topics: Preposition
Geologists assign dates to many rock masses ……….. means of radiometric dating, which is a technique based ……… the atomic structure of the elements.
A. in/for
B. for/in
C. as/with
D. by /on
Select your answer:

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Grammar › ViewWhat is an opinion?
A. Someone’s thoughts/emotions about something
B. Yes
C. Something that can be proven
D. Elephants have long necks
First Conditionals › View
__________________________, you will pass the exam.
A. If he studies
B. If you’ll study
C. If you study
