单项选择题

No sooner had Tom seen Jim ______ he left the room.

A．when
B．before
C．than
D．then

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单项选择题

If the condor population has tripled since two decades ago, about how many are there now（）

A．90.
B．60.
C．33.
D．300.

单项选择题

After reading the story what can we infer about the hospital（）

A．It is a children's hospital.
B．It has strict rules about visiting hours.
C．The nurses and doctors there don't work hard.
D．A lot of patients come to this hospital every day.