Ah, happy, happy boughs! that cannot shedyour leaves, nor ever bid the spring adieu; and, happy melodist, unwearied, for ever piping songs for ever new what does the speaker say about the main topic of the passage?
a. he complains that happiness is hard to find.
b. he praises the advantages of being frozen in time.
c. he bemoans being stuck playing the same tune forever.
d. he admires the way the trees reflect the beauty of nature.

He praises the advantages of being frozen in time.

In this passage, the speaker discusses the advantages of being forever frozen in time. He celebrates the fact that the branches of the trees will never lose their leaves. They will also never have to say goodbye to spring. Moreover, the "melodist" (the musician) will never be tired (unwearied) and will forever play songs that are new to him. He finds this situation extremely happy and desirable.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).