题目内容

[A] over
[B] around
[C] fast
[D] all day

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20 Radiocarbon is reliable in dating an object back to at least 50,000 years.
A Right
B Wrong
C Not mentioned

[A] true
[B] belief
[C] richness
[D] interest

[A] going over
[B] to go over
[C] go over
[D] our going over

Human Races
第36题：