39．A．TV                    B．telegraph             C．telephone               D．satellite

 38．A．to                      B．along                   C．between                 D．of

 37．A．The last             B．Another               C．One                       D．Any other

 36．A．sunny                B．cool                    C．bad                        D．free

 35．A．have                  B．watch                  C．notice                    D．see

 34．A．where                B．what                 C．which                    D．that

 33．A．write                 B．take                     C．send                       D．bring

 32．A．carry                 B．find                     C．keep                      D．choose

31．A．physics              B．chemistry             C．biology                  D．geography

30．一Lily, why are you still here? They are all ready to start．   

    ―I'm sorry, but I ______when to start．

    A．don’t tell             B．didn’t tell              C．haven’t told     D．haven't been told

    Man has invented four kinds of satellites（卫星）．The first kind of satellite studies the  31  of the earth．They are used to make maps．They also help countries to see where they may  32  oil or gold．

      The second kind of satellite is used to guide ships and planes．A ship or a plane can  33  a message to the satellite，and the satellite can find out  34   the ship or the plane is．

The third kind studies the weather．These satellites  35  clouds and strong winds moving across the earth．They warn（警告）countries to make preparations when very  36  weather is coming． 37  kind is used for communication, Telephone calls  38  countries can be sent by these satellites．Some can carry hundreds of calls at the same time．The call is sent to the satellite，then the  39  sends it to a station in the country and this country is being phoned．These satellites also carry pictures；they Can receive mad send about eight  40  at a time．