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简述孙思邈对针灸学的贡献。

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This company （) that it had made a profit of $107 billion by the end of this year, however, most of the share holders did not believe it.

A. states
B. claims
C. asserts
D. announces

A上行文
B联合行文
C授权行文
D越级行文

A HCN; CN-
B H2PO4-; HPO42-
C NH3; NH2-
D H2CO3; CO32-

We could have gone on a picnic if the weather （) nice.

A. was
B. will be
C. is
D. had been