语法与词汇
By 1817 the United States Congress had done away with all internaltaxes and was relying on tariffs on imported goods to provide _____ revenueto run the government.
【正确答案】
D
【答案解析】句意：1817年前，美国国会想尽一切办法在国内征税，依 难度：简单靠进口产品税为政府提供足够的资金。本题考查的是词义辨析。sufficient足够的；充分的，符合题意，故为正确答案。efficient有效率的；有能力的。accurate精确的。additional附加的，额外的。Many technological innovations, such as the telephone, _____ theresult of sudden bursts of inspiration in fact were preceded by manyinconclusive efforts.