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简述视网膜的形成过程。

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The history period for the story in the film is 1960’s America, the period in which _______was still in clashes frequently.

A. slavery
B. prejudice
C. racial discrimination
D. freedom

This film is based on _______.

A. a novel
B. a social issue
C. a biography
D. a true story

The writer of The Weary Blues is_______.

A. Langston Hughes
B. James Arthur Baldwin
C. Martin Luther King
D. Walt Whitman

下列指数中，一般不用来度量通货膨胀程度的是（）

A. 居民消费价格指数(CPI)
B. 批发物价指数(PPI)
C. 采购经理人指数(PMI)
D. GDP平减指数