A.when they have received satellite pictures
B.after they have compared new satellite pictures with earlier ones
C.before they received satellite pictures
D.during they study satellite pictures
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea
[单选题]Each morning, millions of us turn on our radios and televisions for the wea