题目内容

1938～1939年提出了著名的细胞学说的科学家是

A. Leuwenhoek
B. Hook
C. Virchow
D. Schleiden和Schwann
E. Watson和Crick

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于1665年用自制显微镜首次观察到细胞的科学家是

A. Leuwenhoek
B. Hook
C. Virchow
D. Schleiden和Schwann
E. Watson和Crick

Chomsky defines“competence” as the ideal user's () of the rules of his language.

Language is distinguished from traffic lights in that the former has the designing feature of ().

In linguistics research, both () and () approaches are preferred.