单项选择题

Which of the following is the best title for the passage

A.Positive and Negative Ions
B.Methods of the Prediction of Earthquakes
C.Ionizer: Best Way to Improve Your Health
D.Fatigue and Headache: Plagues of Positive Ions
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单项选择题
It can be concluded from the passage that ______.
A.the creation of jobs for all is an impossibility
B.our efforts and resources in terms of dealing with unemployment are insufficient
C.people should start to support themselves by learning a practical skill
D.we should help those whose jobs are only part-time
单项选择题
The enclosures of the 17th and 18th centuries meant that ______.
A.people were no longer legally entitled to own land
B.people were forced to look elsewhere for mean of supporting themselves
C.people were not adequately compensated for the loss of their land
D.people were badly paid for the work they managed to find
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