生活史各阶段均营寄生生活的寄生虫属于A．兼性寄生虫 B．专性寄生虫 C．偶然寄生虫

As poets go, Robert Frost was no longer young when he published his first book of poems, A Boy's Will, in 1913. Though born in San Francisco, he came of a New England family which returned there when he was ten. Like many other writers, he had a brief brush with college and then supported himself by trying different jobs. However, he had been brought up on a farm and he liked farming. Most of all, he liked to write but he could not support himself by writing. In his late 30s he moved to England, where he produced his first book.
At the outbreak of World War I, Frost went back to farming in New Hampshire. Thereafter, although he made many journeys elsewhere, he considered the farm to be his home and its activities became the focus of his poetry.
Frost's verses(诗, 诗体) are a part of a great tradition, shaped by the Roman poet Vergil, whose poetry was mainly about farming. However, though he used farm situations in much of his poetry, he gave them a wide application. He might write about stepping on a rake(耙子) and describe the feeling when it hit him, but he used the incident to show how life gave us lessons.
Some talents in poetry are used up early, but not Frost's. He continued to publish fine poetry for fifty years. He reached the height of his popularity after World War II. If America had a national poet in the 20th century, it was Frost. He was chosen to read one of his poems at the inauguration（就职典礼）of the late President John F. Kennedy, the first poet ever so honored.
The 小题1:__________ of Robert Frost

Personal Information	Nationality	American	Topic of poetry	小题2:__________
	Career	小题3:_____	Favorite	Writing
小题4:____________	Born into a 小题5:__________ Having a brief brush with college Trying different jobs小题6:_________Publishing his first book of poem in小题7:___________ Reaching the height of his popularity after 小题8:_____________
Achievements or honors	Publishing fine poetry continually for fifty years Being regarded as小题9:____________ Being 小题10:___________to be chosen to read one of his poems at the inauguration of an American President