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安慶石化出售的三種品牌的化肥袋上分別標有質量為(40±0.1)kg、(40±0.2)kg、(40±0.3)kg的字樣，從中任意取出兩袋，它們的質量最多相差
[　　]
A．	0.8 kg
B．	0.6 kg
C．	0.5 kg
D．	0.4 kg

答案：B
解析：

從條件中可以看出，在三種化肥中，最多可以超出標準質量0.3 kg，最低低于標準質量0.3 kg，所以從中任意取出兩袋，它們的質量最多相差0.6 kg，所以答案為B．

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The history of Mother’s Day is pretty interesting. An early form of the idea may have originated in the 17th century England as “Mothering Sunday”, on which the servants, who generally lived with their employers, were encouraged to return home and honor their mothers. A special cake, called the mothering cake, was often brought along to provide a festive touch.

Mother’s Day, first suggested in 1872, is linked to the anti-war efforts of Julia Ward Howe. She hoped a day set aside to honour mothers would be a way to promote peace. In 1907 a woman by the name of Anna Jarvis took Howe’s idea a step further and began a campaign for a nationally recognized Mother’s Day.

After considerable effort, Anna Jarvis finally saw her dream realized. On May 9, 1914, President Woodrow Wilson made the official proclamation(宣布) that Mother’s Day would be an annual holiday on the second Sunday in May. And so it is to this day.

For those of us whose lives have been shaped and nurtured by loving moms, the day is a wonderful opportunity to say thank you. Unfortunately not everyone’s experience of family life evokes （喚起）gratitude. In the complicated maze of human existence, not all mother/child relationships are positive. Evoking the image of Mom for some can be an invitation down a painful memory lane.

There is also the reality that not all mothering figures are actually mothers. Hundreds of thousands of children have been raised by foster moms （養(yǎng)母）who never had children of their own, but who gave maternal （母親般的）love to children that needed them. Aunts and older sisters have filled this role as well.

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In our world, there’s no reason why all experiences of family life, good and bad, can’t be included.

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