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【判断题】
只有免疫细胞能产生细胞因子,干细胞不会产生细胞因子。A.
正确
B.
错误
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A.
surprising you
B.
describing a humorous situation
C.
ridiculing someone
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【简答题】Once there was a little girl in a village. She spent summers on her grandfather’s farm. The year she was four, she knew some ducks. The ducks were white with orange feet. They lived in a little wooden...
【单选题】B Once there was a little girl in a village. She spent summers on her grandfather’s farm. The year she was four, she knew some ducks. The ducks were white with orange feet. They lived in a little wood...
A.
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B.
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C.
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D.
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