四六级考试

【单选题】 Which of the following statements is true according to the passage
A．All the researchers doubt that X-rays can be produced by sparks at first.
B．X-rays produced in lab is just the same with those by lightning.
C．The result of the study is in expectation of every researcher.
D．The researchers detected X-rays in sparks of 1.5 million to 2 million volts.

网考网参考答案：D
网考网解析：
[分析] 本题考查阅读细节。在第四段即提到在实验过程中产生火花的电源伏特数。其他选项皆为对原文的错误描述。 查看试题解析出处>>