What does the "ship" represent?
A. Civil War
B. United States of America
C. Abraham Lincoln
D. Whitman
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Try to find the rhyme scheme of this poem.（一个韵脚用一个小写字母表示）
A. abbccded
B. abcddeef
C. aabacded
D. aabbcded
The poem contains ____ stanzas, each of which consists of ______lines.(填阿拉伯数字）
除（ ）之外，下面所有微生物被认为是原核微生物
A. 细菌
B. 酵母菌
C. 放线菌
D. 蓝细菌
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