2. 外语
  3. Threats from nomadic people in the north were 【C1】______ throughout Chinese history. They were continually attacking the Chine

Threats from nomadic people in the north were 【C1】______ throughout Chinese history. They were continually attacking the Chine

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问题      Threats from nomadic people in the north were 【C1】______  throughout Chinese history.  They were continually attacking the Chinese northern 【C2】______  . With each new emperor, came endless debate about how to   【C3】______  the barbarians. There were four options: 【C4】______  offensive campaigns to drive them away or to destroy them; create defensive garrisons; develop diplomatic and 【C5】______  ties with them, or build a wall to keep them out.
     All the options were 【C6】______  at various times.  Experience showed that 【C7】______  campaigns were too costly and very risky, 【C8】______  defensive garrisons could not respond quickly enough 【C9】______  lightning attacks along a long border. The third option would seem to be a very 【C10】______  one and it was in fact tried successfully 【C11】______  a couple of occasions. Wall building became the most favored option in many dynasties. The three dynasties which 【C12】______  the most walls were the Qin, the Han and the Ming.
     The effectiveness of the Great Wall in history is still a controversial 【C13】______  Historical records show that the wall 【C14】______  at many times 【C15】______  repel invaders. Only on two occasions when a dynasty weakened from 【C16】______  were invaders from the north 【C17】______  advance and conquer. 【C18】______  , scholars think the Chinese wall builders were themselves responsible for the unrest on the border. The nomads were people who did not farm, so they 【C19】______  trade with China for many essentials. When the Chinese refused to trade with them, they had no option 【C20】______  raid border towns.
【C17】
选项 A、liable to
B、capable of
C、prone to
D、able to
答案D
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。
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