519. In ancient times,people rarely travelled long distances and most farmers only travelled _______ the local market.
A.longer than
B.more than
C.as much as
D.as far as
520.I guess we've already talked about this before but I'll ask you again just _______.
A.by nature
B.in return
C.in case
D.by chance
519.答案是D;
根据动词travel判断,此处应填有关路程的介词词组,as far as远到…
520.答案是C;
by nature 天生地;in return 作为回报,作为交换;in case 万一,以防;by chance 碰巧。