单项选择题

What do we learn from the conversation

A．Alice didn’t seem to be nervous during her speech.
B．Alice needs more training in making public speeches.
C．The man can hardly understand Alice’s presentation.
D．The man didn’t think highly of Alice’s presentation.
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单项选择题
People in a large area may possess the same DNA thread because______.
A．DNA is characteristic of a region
B．they are beyond doubt of common ancestry
C．DNA strand has the ability to identify individuals
D．their unique identification can be provided via DNA
单项选择题
A．howB．whereC．whenD．whether
A．how
B．where
C．when
D．whether
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