请根据Text B的PPT、词汇学习笔记或者生词本等，在下面的空格处选择合适的介词或者副词。由于提交后不能修改，请大家检查清楚了再交。His comment was irrelevant ___________ the discussion.
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He complained _________ the loud noise we were making.
A. of
B. about
The loss of our friend was a great loss __________ us. (朋友的去世对我们是一个沉重的打击。)
A. to
B. on
a dissertation ____________ applied physics (应用物理的学位论文)
A. to
B. on
the secret _________ how life on earth began (地球生命起源的秘密)
A. of
B. for
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