单项选择题

A．make
B．publish
C．know
D．write
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单项选择题
A．measuresB．measuredC．is measuredD．was measured
A．measures
B．measured
C．is measured
D．was measured
单项选择题
The best title for this passage would be ______.
A．The Atmosphere and Our Environment
B．Research on Radiation
C．Effects of Space Radiation
D．Importance of Protection Against Radiation
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