单项选择题

A．Three weeks.
B．One month.
C．Three months.
D．Over a year.
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单项选择题
A．It helps develop our personalities.B．It enables us to acquire first-hand knowledge.C．It makes our life more interesting.D．It brings about changes in our lifestyle.
A．It helps develop our personalities.
B．It enables us to acquire first-hand knowledge.
C．It makes our life more interesting.
D．It brings about changes in our lifestyle.
单项选择题
Since 1939, numerous scientific studies ______.
A．proved smoking causes fatal diseases
B．proved smoking causes life-shorting diseases
C．proved smoking is a health risk
D．had been made to prove whether smoking causes life shorting
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