数据0、1、2、3、4的平均数是2,则这组数据的方差是( ) A.2 B.2 C.10

题型:选择题

问题:

数据0、1、2、3、4的平均数是2,则这组数据的方差是(  )
A.2B.
2
C.10D.
10
考点:平均数方差
题型:选择题

阅读理解。

     Traveling can be a fun way to gain life experience, especially during the summer break-a week long

school vacation in the United States.

    But if you are a student and don't have enough money for a trip? Don't worry.

    Here are some useful tips.

    ★Save: This probably is the most important preparation for traveling. Cut expenses to fatten your

wallet so you'll have more choices about where to go and how to get there.

    ★Plan ahead: Don't wait until the last minute to plan your trip.Tickets may cost more when bought

on short notice (临时通知). Giving yourself several months to get ready can mean security and savings.

    ★Do your homework:No matter where you go,research the places you will visit. Decide what to see.

Travel books will provide information on the cheapest hotels and restaurants.

    ★Plan sensibly: Write down what you expect to spend on food and hotels. Stick to your plan or

you may not have enough money to cover everything.

    ★Travel in groups:Find someone who is interested in visiting the same places. By traveling with

others you can share costs and expenses.

    ★Work as you go : Need more money to support your trip?Look for work in places you visit.

    ★Go off the beaten path:Tourist cities maybe expensive. You may want to rethink your trip and go

to a less-known area. Smaller towns can have many interesting activities and sights.

    ★Pack necessary things :The most important things to take are not always clothes.Remember

medicine in case you get sick and snacks in case you cannot find a cheap restaurant.

    ★Using the Internet :The Internet can help you to save money.

1. 判断正(T)误(F)。

    ( ) The passage is about how to travel with limited (有限的) money.

2. Will traveling in groups save money?

     ___________________________________________________________

3. How many trips does the writer give us?

     ___________________________________________________________

4. What else should you pack in your bag besides clothes?

    ___________________________________________________________

5. 将文中画线部分译成汉语。

    ___________________________________________________________ 

题型:选择题

材料1:5月5日,阳光灿烂,东南风3~4级.小明和小畅相约到“媚尼风景区”去“媚尼风景区”旅游.

材料2:“媚尼风景区”略图.

据此完成下列问题:

(1)小明和小畅相约在尼湖之南的古寺汇合,这座古寺是______.(填数码)

(2)乘船游览尼湖风光,从A到B快还是从B到A快(均直线航行)?理由是:______

(3)小明和小畅想要享受“漂流探险”的乐趣,你能根据所学的地理知识向他们介绍一下在支流a和媚河上游b“漂流”可能有的特点吗?

支流a______.

媚河上游b______.

(4)C处的地形是______,该处的海拔高度为______多米.

(5)在图中D处拟建-水坝,水坝建成后,三座古寺中有可能被水淹的是______.

(6)此时小明和小畅在古寺②,想去登山顶C,想知道两地的高度差,能帮忙计算吗?______多米.

(7)尼湖风光、媚河漂流探险、古寺探幽、山顶观日出等媚尼风景区开发的旅游项目中,你觉得哪个项目可行______,理由是:______.

题型:选择题

下列关于一些辅助诊断疾病的分析中,正确的是( )。

选项 化学试剂 诊断疾病 检测原理 检测对象
基因探针 甲型H1N1流感 分子杂交 血液中甲型H1N1流感病毒
斐林试剂 糖尿病 与还原糖的显色反应 尿液中葡萄糖
单克隆抗体 肺结核 与抗原基因特异性结合 肺炎双球菌
双缩脲试剂 肾炎 与蛋白质的显色反应 尿液中的蛋白质

A.①

B.②

C.③

D.④

题型:选择题

债券的公开招标定价方式中,如果以募满发行额为止所有投标者的最低中标价格作为中标价格,全体中标者的中标价格是单一的,这叫做()。

A.以价格为标的的荷兰式招标

B.以价格为标的的美式招标

C.以收益率为标的的荷兰式招标

D.以收益率为标的的美式招标

题型:选择题

对凝汽式汽轮机,各级的压力与蒸汽流量成正比。

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