单项选择题

The author does not include among the science the study of ______.

A．Astronomy
B．Literature
C．Chemistry
D．Economics
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单项选择题
In the paragraph that follows this passage, we may expect the author to discuss ______.
A．unforeseen discoveries
B．philosophy
C．the value of pure research
D．the value of technical research
单项选择题
Which statement can be supported by Heather Dickinson and Louise Parker's new findings
A．Radiation has contributed to the disease.
B．Putting a lot of people from rural area in a large towns increases the risk of childhood leukaemia.
C．Population mixing is the most important reason for leukaemia cluster.
D．Childhood leukaemia is caused by an unusual infection.
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