The mountains form a natural            between the two countries so they have no trade relations in history.
A．exchange
B．bridge
C．barrier
D．fence
C
這兩國(guó)之間在歷史上之所以沒有貿(mào)易往來，是因?yàn)樗鼈冎g有一道天然屏障，難以逾越。如果是fence，則指實(shí)實(shí)在在的柵欄，難以構(gòu)成障礙。
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