The writer mentions the political elements in 19th century opera to illustrate
A. the political messages exposed.
B. the universal recognition of high art.
C. the intended changes in popular art.
D. heroes' and heroines' mental states.
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在感染过程的5种表现中，所占比例最低，易识别的是
A. 病原体被清除
B. 隐性感染
C. 显性感染
D. 病原携带状态
E. 潜伏性感染
引起急性出血性结肠炎的病原体是
A. 志贺茵
B. 伤寒沙门茵
C. 新型肠道病毒70型
D. 大肠埃希茵0157型
E. 轮状病毒A组
The author draws a sharp contrast between the housing market and the rest of the economy so as to show
A. the boom of real estate activity.
B. the statistics on home prices.
C. the role of housing market.
D. the degree of consumer spirits.
The author is obviously critical of President Clinton for
A. his failure to match his words with his actions.
B. his lack of historical knowledge about the WTO.
C. his putting the issue in a wrong perspective.
D. his exaggeration of WTO's economic role.
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