面对镜子练习耳语可以练习不同距离下手势的强弱和大小。()
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The doctor performed an operation on him as soon as he was sent to the hospital.
We must take some measures to control the pollution.
He has ________ on his farm.
A. 20 head of cattles
B. 20 heads of cattles
C. 20 heads of cattle
D. 20 head of cattle
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