61. The problem of pollution has turned up on every continent on earth even Antarctica.
Winter Quarters Bay,on Antarctica,is the site of an important scientific station.
Though the population here is never more than a few thousand people, this bay is as polluted as many city harbors.
The reason is that for a long time, people at the station dumped garbage into the water.
However,that has stopped now because of an international agreement.
According to the agreement,scientific communities in Antarctica must
a. dump all their garbage into the bay.
b. take all their garbage away from Antarctica.
c. close down all their scientific stations.
d. stop polluting the air in Antarctica.