专四专八考试

【单选题】Threats from nomadic people in the north were (31) throughoutChinese history. They were continually attacking theChinese northern (32) . With each new emperor, came endless debate about how to (33) the barbarians. There were four options. (34) offensive campaigns to drive them away or to destroy them; create defensive garrisons; develop diplomatic and (35) ties with them, or build a wall to keep them out.
All the options were (36) at various times.Experience showed that (37) campaigns were too costly and very risky, (38) defensive garrisons could not respond quickly enough (39) lightning attacks along a long border. The third option would seem to be a very (40) one and it was in fact tried successfully (41) a couple of occasions. Wall building became the most favored option in many dynasties. The three dynasties which (42) the most walls were the Qin, the Han and the Ming.
The effectiveness of the Great Wall in history is still a controversial (43) . Historical records show that the wall (44) at many times (45) repel invaders. Only on two occasions when a dynasty weakened from (46) were invaders from the north (47) advance and conquer. (48) , scholars think theChinese wall builders were themselves responsible for the unrest on the border. The nomads were people who did not farm, so they (49) trade withChina for many essentials. When theChinese refused to trade with them, they had no option (50) raid border towns.
A．liable to
B．capable of
C．prone to
D．able to

网考网参考答案：D
网考网解析：
短语辨析题。此句为only on two occasions置于句首的部分倒装句，主语invaders from the north前有动词 were。liable to意为“容易…的”，prone to意为“倾向于…”，这两项不符合该处语境。[B]和[D]含义相同，但be capable of后要接续动名词doing sth..，因此只有be able to合适。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>