They both attract scientists’’ attention,They can both -找考题网

单项选择题

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.

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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.

单项选择题

Sound waves reflected from a hill can be used to estimate______.

A．height of the hill
B．speed of sound
C．distance of the hill
D．intensity of sound

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