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【简答题】
阅读理解。 Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is another factor that can cause your heart problems more immediately: the air you breathe. Previous studies have linked high exposure (暴露)to environmental pollution to an increased risk of heart problem, but two analyses now show that poor air quality can lead to heart attack or stroke (中风)within as little as a few hours after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants (污染物)were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of 'moderate' (良好)quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14 hours of exposure. The authors of both studies stress that these risks are relatively small for healthy people and certainly modest compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation by the EPA of pollutants may not only improve environmental air quality but could also become necessary to protect public health. 1. The text mainly discusses the relationship between . A. heart problems and air quality B. heart problems and exercising C. heart problems and smoking D. heart problems and fatty food 2. The underlined word 'modest' in Paragraph 3 most probably means . A. relatively high B. extremely low C. relatively low D. extremely high 3. What can we learn from the text? A. Eating fatty food has immediate effects on your heart. B. The EPA conducted many studies on air quality. C. Moderate air quality is more harmful than smoking, D. Stricter regulations on pollutants should be made. 4. The author's purpose of writing the text is most likely to . A. inform B. persuade C. describe D. entertain
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【简答题】一句话描述元组与列表的区别
【单选题】列表与元组的区别?
A.
列表内容可更改,元组不可更改
B.
列表内容可更改,元组也可更改
C.
列表内容不可更改,元组可更改
D.
列表内容不可更改,元组也不可更改
【多选题】当( )中任一项不符合规定时,该批水泥为废品。
A.
氧化镁
B.
细度
C.
三氧化硫
D.
初凝时间
E.
安定性
【判断题】列表与元组的区别在于列表的元素是可变的,元组的元素是不可变的。
A.
正确
B.
错误
【多选题】当()中任一项不符合规定时,该批水泥为不合格品。
A.
氧化镁;
B.
细度;
C.
三氧化硫;
D.
初凝时间;
E.
安定性。
【单选题】下面哪个命令用来卸载一个内核模块()。
A.
rmmod
B.
unmod
C.
delmod
D.
modprobe
【判断题】元组与列表主要的区别是元组的元素不能修改。
A.
正确
B.
错误
【简答题】简述元组与列表的区别
【判断题】两难挥发非电解质稀溶液(水为溶剂),若二者的质量摩尔浓度相等,其凝固点就一定相同。
A.
正确
B.
错误
【单选题】以下哪项不是新建企业选址要考虑的因素?()
A.
经济因素
B.
技术因素
C.
政治因素
D.
人员因素
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