单项选择题

A．Only humans respond to emotions by shedding tears.
B．Only humans shed tears to get rid of irritating stuff in their eyes.
C．Only human tears can resist the invading bacteria.
D．Only human tears can discharge certain chemicals.
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单项选择题
A．Teacher-student.B．Master-maid.C．Mother-son.D．Husband-wife.
A．Teacher-student.
B．Master-maid.
C．Mother-son.
D．Husband-wife.
单项选择题
A．Only one out of four girls cries less often than boys.B．Of four boys, only one cries very often.C．Girls cry four times as often as boys.D．Only one out of four babies doesn’t cry often.
A．Only one out of four girls cries less often than boys.
B．Of four boys, only one cries very often.
C．Girls cry four times as often as boys.
D．Only one out of four babies doesn’t cry often.
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