题目内容

It is well known that Edison's success was ____ to his intelligence and hard work.

A. referred
B. contributed
C. subjected
D. attributed

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There will be an exciting film ____ at the cinema next week.

A. on
B. in
C. up
D. over

The villagers all agreed to ____ the railway into the mountains.

A. spread
B. enlarge
C. extend
D. increase

B细胞表面，BCR信号转导的分子是

A. CD79a/CD79b
B. CD40
CD32
D. CD19

不属于B细胞表面抗原的

A. CD80
B. CD21
CD28
D. CD19