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12.下列哪种菊科植物没有乳汁（）。

A. 蒲公英
B. 马兰
C. 黄鹌菜
D. 莴苣

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13.下列哪一种植物不属于蒿属（）。

A. 黄花蒿
B. 青蒿
C. 陈茵蒿
D. 茼蒿

-- _________ does your cousin usually go to work on foot? -- He says it's good for his health.

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Today I knew a new classmate, Ann. She is ________ America.

A. for
B. from
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-- ____ did you go to Shanghai? -- By train.I like taking a train.

A. Why
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C. Where
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