A、
Stone flakes were made by early humans.
B、
Stone flakes may not be made by early humans.
C、
Stone flakes were used by monkeys to crack open nuts.
D、
Stone flakes were used by ancient humans to cut bones.
【正确答案】
B
【答案解析】
A、
The flakes made by early humans are more complex.
B、
The flakes made by monkeys are used as tools.
C、
The flakes used by early humans are made by monkeys.
D、
The flakes made by monkeys have cut-marks.
【正确答案】
A
【答案解析】
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