按苷键原子不同苷分类为A．黄酮苷、木脂素苷、环烯醚萜苷等B．单糖链苷、双糖链苷C．氧

一天，小明在炉子旁边，将手中的铁钩在炉子中烧得通红．他突然想到，如果将磁铁放在火中烧，会有什么现象呢？是磁性变强，还是磁性变弱？小明猜想，可能会变强吧．那么究竟怎样呢？小明设计并做了如图所示的实验：将一条形磁铁的一端固定在铁架台上，另一端吸着一些小铁钉．现在，用酒精灯给磁铁加热．经过一段时间后，当磁铁被烧红时，小明发现小铁钉纷纷落下．

请你回答下列问题：

（1）根据上述短文的阅读，你可以得出什么初步结论？

（2）你认为这一结论可以有什么应用？请举一个应用的设想．

阅读理解

     England is not a big country: from north to south and from east to west it is only about three hundred

miles across.   But for a small country it has a surprising range of climate.  People who have never visited

England, or who have visited only one part of it, often make the mistake of thinking that it is a cold and

wet country, except for the summer months of June to September.  This is probably true of the north of

England and the Midlands.  In the south, however, the climate is much more pleasant.   One result is that

when people retire from a job in the north they often prefer to move down to the milder south.

      Perhaps the warmest part of the country is thesouthwest, which consists of the countries of Devon and

Cornwall.  The warm Gulf Stream flows across the North Atlantic Ocean from the Gulf of Mexico and

makes the coastal regions of the southwest quite warm.  Palm trees, bamboo and many semi-tropical

plants grow well in the southwest of England.  Flowers and vegetables ripen as much as a month earlier

than those elsewhere.  Farmers in the area obtain a higher price for their vegetables and flowers because

they are ready earlier.  In winter there may be several feet of snow in other parts of England but there

will probably be no snow at all in the southwest.  This may be one of the reasons why the southwest is

one of England's most popular holiday areas.

1.  The distance from the center of England to south coast is about        . 

A.  one hundred miles

B.  three hundred miles

C.  one hundred and fifty miles

D.  six hundred miles

2.  England is a country         .  

A.  with a cold and wet climate

B.  with a surprising climate

C.  with a pleasant climate

D.  with a variety of climates

3.  According to the passage        . 

A.  flowers and vegetables from Devon are on themarket one month earlier

B.  farmers in the southwest grow as many vegetables and flowers as farmers elsewhere

C.  people in the southwest have to pay a higher price for vegetables and flowers

D.  vegetables in Comwall ripen as much as a month earlier than flowers

4. In the north of England and the Midlands,       . 

A.  it is cold and wet all the year round

B.  the climate is pleasant as a whole

C.  it is warm most of the time in a year

D.  only the summer is not cold and not wet

注射成型工艺条件的“温度”因素一般不包括（）。

A、料筒温度

B、螺杆温度

C、喷嘴温度

D、模具温度

宋朝时期，现在的哪个省份不在北宋辖区（）。

A、云南

B、广东

C、陕西

D、山西

少儿卫生学的定义、研究目的是什么？