单项选择题

According to the passage, the invention of the visible - light microscope allowed scientists to ______.

A．see viruses directly
B．develop the electron microscope later on
C．understand more about the distribution of the chemical elements
D．discover single-celled plants anal animals they had never seen before
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单项选择题
Which of the following is NOT mentioned when the author explains the reasons of the rapid growing number of English speaker
A．New pupils are required to learn English at school.
B．Monolingual old people are encouraged to speak English.
C．Employees have to learn English if they want to get a chance of promotion.
D．Scholars use English as the language of their academic works more often than other languages.
单项选择题
The word nudge in the first sentence of paragraph six means ______.
A．progress
B．encouragement
C．push
D．growth
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