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.
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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
单项选择题
A．The first earthquake did wake him up but he didn’’t realize what was happening.B．The first earthquake woke up the man but he didn’’t want to leave his house.C．The man wasn’’t woken up by the first earthquake.D．The man was hurt by the earthquake.
A．The first earthquake did wake him up but he didn’’t realize what was happening.
B．The first earthquake woke up the man but he didn’’t want to leave his house.
C．The man wasn’’t woken up by the first earthquake.
D．The man was hurt by the earthquake.
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