单项选择题

A．Private donations.
B．Grants from corporations.
C．Government funding.
D．Fees paid by students.
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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
单项选择题
A．The woman is watching an exciting film with the man.B．The woman can’’t take a photo of the man.C．The woman is running toward the lake.D．The woman is filming the lake.
A．The woman is watching an exciting film with the man.
B．The woman can’’t take a photo of the man.
C．The woman is running toward the lake.
D．The woman is filming the lake.
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