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【单选题】
某校在“创新素质实践行”活动中组织学生进行社会调查，并对学生的调查报告进行了评比，如图是将某年级60篇学生调查报告的成绩进行整理，分成5组画出的频率分布直方图，已知从4个小组的频率分别是0.05、0.15、0.35、0.30，那么在这次评比中被评为优秀的调查报告有（分数大于或等于80分为优秀，且分数为整数） [ ]A.
18篇
B.
27篇
C.
25篇
D.
24篇
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举一反三
【单选题】Which of the following is a suggestion from the writer to people planning to live in the big cities?
A.
Move to a better part of the city.
B.
Talk to people not interested in it.
C.
Think carefully about everything.
【单选题】Which of the following is typical of a cosmopolitan city?
A.
People from different parts of the world live and work together.
B.
There are almost three million people living and working in the city.
C.
There are super amenities, ranging from the excellent shops and restaurants.
D.
People can enjoy an urban lifestyle. with cultural events such as concerts and operas.
【简答题】Some middle-aged people tend to suffer from Biochemical depression which might result from ______ within the brain.
【多选题】 随机游走序列是
A.
平稳序列
B.
非平稳序列
C.
统计规律不随时间的位移而发生变化的序列
D.
统计规律随时间的位移而发生变化的序列
E.
均值为常数，方差随时间变化而变化的序列
【简答题】关于单独海损与共同海损特点的比较,正确的表述包括( )。A. 单独海损是承保风险造成的,而不是由人的有意识行为作出的;共同海损必须是有意识的而不是一种意外的损失 B. 单独海损只涉及船舶或货物一方的利益;共同海损则涉及多方的利益 C. 单独海损适用委付;共同海损不适用委付 D. 单独海损只能由受损失一方单独承担;共同海损则是由所有的受益方按比例分摊
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