电工王某未系安全腰带，不戴安全帽，只穿汗衫就上梯进行室外抢修接线工作，董某则在下监护

下图是经纬网图层和中国省级行政中心图层的叠加图，图中经纬线间隔度数相等。读图，回答下列各题。

小题1:经纬网的纬线间距为

A．3°

B．5°

C．8°

D．10°小题2:图上标出的经纬网格区中

A．②与③都处于暖温带

B．随地球自转，③的角速度比④小

C．从春分到夏至，①比④的昼长变化幅度大

D．从夏至到秋分，②比⑤的正午太阳高度角变化幅度大小题3:人口密度差值最大的两个网格区是

A．①和④

B．②和③

C．③和⑤

D．④和⑤小题4:从地形和降水条件分析，最易发生泥石流的网格区是

A．①

B．②

C．④

D．⑤

小李为了“研究凸透镜成像规律”，做了如图所示的实验，请你帮他完成下列问题

（1）凸透镜、蜡烛、光屏应放在同一直线上，并使烛焰、凸透镜、光屏三者的中心在_________高度；

（2）当蜡烛距凸透镜的距离小于该凸透镜的焦距时，在轴上无论怎么移动光屏，光屏上也接收不到烛焰的像，此时所成的像是________像；（填“虚”或“实”）

（3）将蜡烛放在距凸透镜1.5倍焦距处，成倒立、________的实像；（填“放大”或 “缩小”）

（4）奥运会安保检查采用的人脸识别系统中，摄像机可以自动将镜头前1m处的人脸拍摄成数码相片，摄像机镜头是利用了凸透镜成倒立、_______实像的原理制成的。（填“放大”或“缩小”）

观察下列算式：

1=1=1²

1+3=4=2²

1+3+5=9=3²

1+3+5+7=16=4²

…

按规律填空：

（1）1+3+5+7+9=______；

（2）1+3+5+…+2005=______，1+3+5+7+9+…+______=n²

（3）根据以上规律计算101+103+105+…+501．

Health experts have long worried about the increasing rate of obesity in kids. It’s an important concern: Being very overweight or obese during childhood can lead to serious problems normally seen in adults, such as diabetes and high blood pressure. Poor diets and a lack of exercise are usually the causes. But would you ever have imagined there might be a connection between the bacteria that lived in your guts （内脏）when you were a baby and the chance that you would become overweight?

Scientists in Finland recently found just such a link. In a recent study, they showed that overweight kids had different species of bacteria living in their guts.

You probably think of bacteria only as germs that can make you sick. While it’s true that some bacteria can make people ill, your body actually depends on some types of bacteria to help you digest food and extract nutrients from it. These “good” bacteria live in your guts, where they process the food you eat.

Human babies get these bacterial helpers from their moms. When a baby is born, some of the bacteria in the mother move into the baby’s body. Growing babies get additional “good” bacteria from the milk their mothers produce. And it turns out the bacteria might play an important role in regulating weight just six years later.

So how could these bacteria affect weight? The researchers still haven’t tested that question, but future tests might lead to an answer.

小题1:The “link” in Paragraph 2 refers to the relationship between _______.

A．bacteria and the chance of being overweight

B．obesity and diabetes

C．diets and the chance of being overweight

D．bacteria and exercise小题2:Which of the following is NOT the function of “good” bacteria?

A．Helping to digest food.

B．Helping to take nutrients from food.

C．Helping to regulate weight.

D．Making a person ill.小题3:The purpose of writing this passage is to _______.

A．introduce the role of bacteria in children’s weight

B．analyze the influence of obesity on kids

C．give advice on how to lose weight quickly

D．explain the function of bacteria in foods

某项发盘于某月12日以电报形式送达受盘人，但在此之前的11日，发盘人以传真告知受盘人发盘无效，此行为属于（）。

A、发盘的撤回

B、一项新发盘

C、发盘的撤销

D、发盘的修改