Topics: Vocabulary
__________ is a technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains
A. isotope dating
B. retroactive dating
C. radioactive dating
D. index fossilization
Select your answer:
Random Topics:
The Structural Types of SentencesOffering HelpPreposition on TimeAdjective ClausesAdverbs of Manner, Likes and Preferences-ing form and the to-infinitiveVerb PhraseVerbs + Gerund or InfinitiveRelative PronounsPast Tense (Regular and Irregular)Other quiz:
Object Pronouns › ViewGrandpa is telling a story. We are listening to _______.
A. him
B. he
C. I
TOEFL Grammar › View
“I don’t think it will rain at all today, do you?”
“No, I _____ so.”
A. think not
B. not think
C. don’t think
D. do think not