Excel在单元格中只能显示计算结果，不能显示公式，公式只在编辑栏中显示。()
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The word "significant" in Paragraph 3 most probably means______.
A. responsible
B. meaningful
C. fatal
D. harmful
Radiation can cause serious consequences at the lowest level______.
A. when it kills few cells
B. if it damages the few cells
C. though the damaged cells can repair themselves
D. unless the damaged cells can reproduce themselves
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