The sound of the roaring of a tiger is ______ heard by jungle dwellers ______ feelings of unease, for a year does not elapse without victims falling to the tiger's ferocity.

单项选择题The ozone layer plays as great a role in the stability of spaceship Earth as ______ the waters of its lakes, ponds, oceans, rivers, and streams.

单项选择题She is furious (of) her son's grades in school, (which) explains why Mark is jealous (of) Julia's high marks (on) the exam.