单项选择题

A．Two months ago.
B．Five months ago.
C．Five years ago.
D．Eight years ago.
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单项选择题
A．They both attract scientists’’ attentionB．They can both be quite challengingC．They are both thought-provoking.D．They may both lead to surprising findings.
A．They both attract scientists’’ attention
B．They can both be quite challenging
C．They are both thought-provoking.
D．They may both lead to surprising findings.
单项选择题
A．Private donations.B．Grants from corporations.C．Government funding.D．Fees paid by students.
A．Private donations.
B．Grants from corporations.
C．Government funding.
D．Fees paid by students.
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