請依下文回答第46題至第50題      Australia is literally a land apart. While it is attractive and welcoming to visitors, from the perspective of     46      theyare very keen to keep themselves separate. Australia has had some bad experiences                   47    misguidedly importingrabbits and cane toads into the country.    48    hence has become a major concern. The government maintains adatabase of about 20,000 materials that have the potential to cause trouble and must be declared at the    49    . Ifyou fail to declare them upon arrival, it is almost certain they will be confiscated and you may    50    have to paya fine up to $66,000. If you have declared all the items in the Incoming Passenger Card, then even if the goods arenot permitted and must be confiscated, you will not be liable for a fine. The authorities are not unreasonable, juststrict.
【題組】46
(A) safety
(B) nature
(C) variety
(D) ethnicity