单项选择题

The word "inflection" ( Line 3, Para. 4 ) may probably means " ______"

A．changes in the forms of words
B．changes in sentence structures
C．changes in spelling roles
D．words that have similar meanings
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单项选择题
In the past 1500 years of development, the English language ______.
A．has been changing violently all the time
B．has been static all the time
C．has been changing slightly sometimes
D．has been static sometimes
单项选择题
American scientists are very concerned about the ozone because ______.
A．the ozone is another form of oxygen
B．the ozone could keep us from the hurt from the sun's rays
C．the ozone is decreasing as a result of pollution
D．the ozone is very valuable in atmospheric research
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