【名词&注释】
自然界(nature)、看得见(perceptibly)、唯物主义物质
[单选题]在下列哪种波长处测定DNA吸光值的变化可作为监测DNA是否发生变性的指标?
A. 210nm波长
B. 230nm波长
C. 260nm波长
D. 280nm波长
E. 340nm波长
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举一反三：
[单选题]The word “mania” （Line 4， Paragraph 2） most probably means
A. fun.
B. craze.
C. hysteria.
D. excitement.
[多选题]下列哪些属于马克思主义以前的唯物主义物质观
A. 物质是看得见摸得着的物质
B. 物质是不可再分的原子
C. 物质就是自然界
D. 物质的本质是不可认识的
[单选题]Which of the following is true according to the text?
A. Personal search agents are indispensable to job-hunters.
B. Some sites keep E-mailing job seekers to trace their demands.
C. Personal search agents are also helpful to those already employed.
D. Some agents stop sending information to people once they are employed.
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