单项选择题

How does the man feel about his grade

A．It was an improvement.
B．It was disappointing.
C．It was unfair.
D．It was satisfying.
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单项选择题
Which of the following statements is true according to the passage
A．Genes may contribute to some common diseases.
B．Environmental factors cause more diseases than genes.
C．It is common that most fatal diseases are caused by genes.
D．It is impossible to get clear-cut genetic answers at present.
单项选择题
While the male bird was dancing ______.
A．he showed off his tail feathers
B．he shook leaves off the tree
C．he threw away some feathers
D．he cried more frequently
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