While revenue is a primary consideration, Customs duties may also be levied to protect the domestic industry from foreign .
Aparticipation
Bcompetition正確答案
Cinvestment
Dsupport
答案與詳解
competition 是「競爭」。關稅的兩大功能之一就是「保護性關稅」(protective tariff),防止外國商品以低價衝擊本國產業,正是 protect from foreign competition 的固定搭配。
