单项选择题

According to the passage, the author considers the reduction of energy in an empty region of space to which a real particle has been added to be ______.

A．a well-known process
B．a frequent occurrence
C．a fleeting existence
D．an unexpected outcome
<上一题 目录 下一题>
热门 试题

单项选择题
According to the article, which of the following statements is TRUE
A．Chimpanzees' sense of time is as good as man's.
B．Man developed from apes.
C．Memory and foresight contribute to intelligence.
D．Monkeys and apes are almost as intelligent as man.
单项选择题
The word contingencies in the 5th paragraph means ______.
A．uncertainties
B．dependent conditions
C．incidental thoughts
D．events that may occur
相关试题