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Questions 56-58 refer to the following letter.
Lasell, Inc.
676 Keenan Dr.
Fort Worth, Texas 76035
Dear Customer,
As you may be aware, Lasell has routinely received commendations for our commitment to product safety. Every item that is sold under the Lasell name is subjected to rigorous product testing. When design flaws are detected, the model is revised to eliminate the problem. In addition, our products are built from the strongest plastics to ensure that you never have a problem with a Lasell product.
In the unlikely event that products are released with previously undetected flaws, great steps are taken to ensure that every flawed item is removed from the market and replaced for customers.
Late last week, our exceptional quality assurance team identified a previously undetected minor flaw in the air filters in our 6000X model. Because our records show that you have recently purchased a 6000X vacuum cleaner, we want to inform you of this flaw and of your right to return the product
for a new one. Please be assured that there is absolutely no safety risk to you or any operators of the machine. However, to ensure that
you are satisfied with the quality of our products, we would like to ask you to contact the Lasell store nearest to you. The store will arrange to pick up your machine at your home at a time that is convenient for you.
Our customers’ satisfaction is foremost on our mind, and we want to make sure that you are not inconvenienced in any manner. A replacement vacuum cleaner will be delivered at the time of the pickup. Furthermore, customers who share in the exchange will receive a free gift in appreciation of their business.
Sincerely,
Joe Glidden
What is the purpose of the letter?
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
