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Questions refer to the following notice and billing statement.
Estimated Bills
Although we try to read your gas meter every month， there are times when we simply cannot. We may not be able to access it if there is no one at your home to let us in. Weather conditions sometimes make it unsafe for meter readers to do their job． And meters do occasionally malfunction， making an accurate reading impossible．
When your meter is not actually read， you will receive an estimated bill. The estimate is based on weather trends and how much energy you have used in the past. When we are unable to get an actual meter reading， you will see the word “estimated” printed next to the meter reading on your bill.
Estimates can be avoided if you send us a reading that you have taken yourself．
Here are two ways to help prevent an estimated bill.
Call us with your meter reading at 18005551991. The best time to call is one day before your scheduled meterreading day. （Your meterreading date appears on page one of your Newtown Gas Company bill.）
Go to our Web site at www.newtowngasco.com/meter to send us your meter reading．Send your reading at least one day before your scheduled meterreading day.
If you use either of these two methods to provide us with your reading， you will see the words “customer reading” next to the reading on your bill. If your meter readings have been estimated for four straight months， you must call us with your meter reading．
NEWTOWN NATURAL GAS COMPANYSaurabh Khan
Monthly statementMay80 Mount Street
Account number 5252670Vancouver， Canada
UsageMeter 1546774Account Summary
Actual readingApril 20133 thermsPayment received April 30＄145.76
Customer readingMay 1949 thermsTotal amount due June 7＄ 57.74
Average daily gas use （in therms）
Please mail your payment to Newtown Natural Gas Company， P.O. Box 388， Vancouver， Canada． Your next meter reading is scheduled for June 18.
According to the notice， how does Newtown Gas estimate the amount of gas used? （ ）
通知中第二段第二句提到“This estimate is…past”，“以过去使用量为基准进行预算”，所以A项为正确答案。average “平均”。fixed amount “固定的量”。neighboring “附近的，邻近的”。
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？（）
