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阅读A、B、C三篇材料，然后从各个小题所给的A、B、C、D四个选项中选出最佳选项。

        Have you ever dreamed about sending a letter to yourself or your friends in the future? While express mail(快递) is a fast way to send your letters, there is another type of mail appearing in China as a new business—future mail.

     “The letter should be sent next Mother's Day and not a day earlier!” Lin Xiaofan, acollege student in Shanghai, tells one of the companies offering the service.

Lin Xiao fan wrote the letter to her mother nearly a year earlier to express her love to hermother for next Mother's Day.

    “Offering thisservice makes people slow down and lets them understand the meaning of ‘time’in another way,” said Zheng Zhimin, manager at a “future mail” company. Zheng thinks “future mail” letters help remind us of care, friendship and love.

      While “futuremail” is becoming more and more popular, some people are wondering what will happen if the postal address changes or if the company goes broken before theletters arrive.

     Zheng said customers are glad to sign a contract(签订合同) to make sure that they canbe compensated if their letters are lost or damaged.

    Most of the customers are college students and young white-collar(白领) workers. Psychologists (心理学家) said that young Chinese might have a new way to express their feelings through this service. Most peopleput their hopes and wishes in the letter so that they can experience the connection(联系) between the past and the present when they receive theletter.

稻田中有一条食物链：稻→虫→蛙→蛇，若长期被重金属镉污染，则体内镉含量最多的生物是（  ）

下列说法有误的一项是（    ）

下列说法有误的一项是（    ）

下列说法有误的一项是（    ）

-3的倒数是（    ）

根据课文《雪顿节上看赛牛》填空。

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