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【单选题】
Recent epidemiological studies have shown that the residents of Greenborough County have substantially higher rates of pancreatic and stomach cancer than do the residents of the state as a whole. Researchers have concluded that the high rates of these cancers are due to the presence in the county of a large petrochemical facility that manufactures chemicals known to be carcinogenic. Which of the following, if true, most weakens the researchers' conclusion?A.
The county's residents have the highest rate in the state of smoking, a habit that has been conclusively linked with higher rates of several types of cancer.
B.
The residents of the county get their water from springs that could not have been contaminated by the petrochemical plant implicated by the researchers.
C.
The petrochemical plant has been found to be in violation of EPA emissions standards five times in the last two years.
D.
Residents of Greenborough County, like people throughout the state, are fond of spicy and fatty foods that have been linked to a number of health problems.
E.
There are no known medical treatments that can permanently halt the development of certain forms of pancreatic cancer.
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【多选题】党对社会主义建设道路的初步探索,留下深刻教训教训的有( )
A.
必须把马克思主义与中国实际相结合。
B.
必须从实际出发进行社会主义建设，建设规模和速度要和国力相适应。
C.
必须发展社会主义民主，健全社会主义法治。
D.
必须认识到在社会主义初级阶段 无产阶级与资产阶级的矛盾将长期存在
【多选题】党对社会主义建设道路的初步探索,留下的深刻教训有( )。
A.
必须把马克思主义与中国实际相结合，探索符合中国特点的社会主义建设道路
B.
必须正确认识社会主义社会的主要矛盾和根本任务，集中力量发展生产力
C.
必须从实际出发进行社会主义建设，建设规模和速度要和国力相适应，不能急于求成
D.
必须发展社会主义民主，健全社会主义法制
E.
必须坚持对外开放，借鉴和吸收人类文明成果建设社会主义，不能关起门来搞建设
【简答题】党对社会主义建设道路的初步探索留下了哪些深刻教训?
【简答题】混凝土围堰有那些特点(优点)？
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