The postal authorities helped in developing the commercial use of aeroplanes.A.TrueB.False
The postal authorities helped in developing the commercial use of aeroplanes.
A.True
B.False
C.Not mentioned
The postal authorities helped in developing the commercial use of aeroplanes.
A.True
B.False
C.Not mentioned
A、make his writing more personal
B、list all the facts and make comparison
C、voice his personal opinions
D、make his writing more scientific
A.the most expensive mechanical heart
B.a mechanical heart used in the 1980s
C.as advanced as Abiocor
D.replacing Abiocor
A.hemoglobin
B.cholesterol
C.blood sugar
D.bilirubin
A.influential
B.effective
C.beneficial
D.healthy
A.defense
B.standing
C.protection
D.room
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