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Set an Example for the Children 为孩子树立榜样 Write an essay of 160-200 words based on the drawing. In your essay, you should 1)describe the drawing briefly, 2)explain its intended meaning, and 3)give your comments.

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根据胎盘屏障结构胎盘可分为四类，牛、羊的胎盘属于

A. 上皮绒毛膜胎盘
B. 内皮绒毛膜胎盘
C. 血绒毛膜胎盘
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E. 子叶胎盘

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Showing Concern 表示关心 Write an e-mail of about 100 words based on the following situation: You phoned your friend Mary several times yesterday but she didnt answer your call at all Find out what happened and ask if she need your help. You should include the details you think necessary. Do not sign your own name at the end of the e-mail Use "Id Ming" instead. Do not write the address.