单项选择题

The passage mainly talks about ______.

A．the impact of mobile phone signals on health
B．the negative impact of current signals on health
C．the long-term effects of mobile phones on health
D．the possible causes of the impact of mobile phones

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______ leaves the office last should turn off the air conditioner.A) Who C) The personB) Whoever D) Anyone

A．______ leaves the office last should turn off the air conditioner.
B．Who
C．Whoever
D．The person
E．Anyone

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Taxi drivers often remind passengers to ______ their belongings when they leave the car.A) hold C) catchB) grasp D) collect

A．Taxi drivers often remind passengers to ______ their belongings when they leave the car.
B．hold
C．grasp
D．catch
E．collect