11．Telecommunication developments have enabled people to send messages       television，radio and electronic mail．

  A．via        B．amid      C．past     D．across

12．The philosophy class began with twenty students but three        after the midterm exam．

  A．picked up    B．turned out    C．dropped out   D．kept up

13．The following account by the author      the difference between European and American reactions．

A．illustrates    B．acquires，    C．demands    D．deletes

14．Long _____ to harmful pollutants is most likely to lead to a decline in health．

A．contact      B．touch        C．use     D．exposure

15．_____ being fun and good exercise，swimming is a very useful skill．

A．Rather than   B．Apart from   C．Instead of    D．Owing to

16．Her husband is interested in designing electronic_____．

A．safety        B．management  C．routine           D．devices

17．Gestures are an important means to _____ messages．

A．study    B．convey    C．keep   D．exploit

18．_____ preparations were being made for the Prime Minister's official visit to the four foreign countries．

A．E1aborate    B．Wise    C．Neutral D．Optional

19．This local evening paper has a _____ of twenty-five thousand．

A．contribution    B．number    C．celebration D．circulation

20．On the local market，_____ fruits and vegetables are now commonly sold．

A．enough    B．exotic    C．famous D．1imited