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【简答题】
第4，原始咽尾侧，底部正中出现一纵行的沟叫___________，它逐渐加深并从尾端至头端逐步愈合，形成___________，是喉、气管、支气管和肺的原基。
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反馈参考答案：
举一反三
【单选题】You can ________ in your dictionary. [ ]
A.
look up them
B.
look up they
C.
look them up
D.
look they up
【单选题】If you don't know how to pronounce new words, ________in a dictionary. [ ]
A.
look them up
B.
look they up
C.
look up them
D.
look up they
【单选题】If you don't know how to spell new word, in a dictionary. [ ]
A.
look them up
B.
look they up
C.
look up them
D.
look up they
参考解析：
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