Chinese:如何选择一件好的衣服?

     每个人都要学会选择一件好的衣服，怎样才算是好的衣服呢？我认为要合适自己、价格适当、材料舒适。

          

     当人们看到你的第一眼，会注意到你的服饰，他们可能会因为你的服饰来判断你这个人。所以在选衣服的时候一定要选择适合自己的，而不是跟随潮流，跟随潮流不一定可以穿出自己的风格。即使那些衣服衣服很好看，但是穿在自己身上不一定好看。

     不同的肤色搭配不同的衣服。黑皮肤搭应搭配暖色调的衣服；肤色红润的人不宜穿带有紫罗兰色、亮黄色、纯白色，因为这些颜色，能过份突出皮肤的红色；肤色较白的人不宜穿冷色调的衣服，因为那样会显得肤色更苍白。相对的，不同的身材搭配不同的服饰；不同的脸型搭配不同的服饰。而不能随便选衣服穿。

     买价格适当的衣服。买衣服是要买自己喜欢的，需要的，合适的。不要因为看到别人都买品牌的衣服，所以自己自己也要跟随潮流而去买并不适合自己而且价钱也是极贵的衣服，只是为了一份虚荣心。

     买材料舒适的衣服。有些衣服奢华而不耐穿，那些衣服只可以用来珍藏、欣赏，或者在宴会时偶尔的穿一穿。如果衣服的材料不好，穿在身上不舒适，也会很容易引来皮肤疾病。

     选择衣服是很重要的。举一个例子：假如你去参加一个晚会。需要穿得庄重一些、不随便，你就要选择晚礼服、西装等类似于这样的服装，而不是穿牛仔裤和T-Shirt。

     所以，当你选择一件好的衣服的时候，需要考虑到场合、是否适合自己、价格是否适当、材料是否舒适，以及自己是否需要、喜欢。

feiyi 2-1A

Sloving the mystery of Chemical formulae

A & B 

Naming of chemical substances begins with the names of the elements. The discoverer of an element has traditionally had the right to name it, and many of the names refer to the element's properties or to geographic locations.

The system used for naming chemical substances depends on the nature of the molecular units making up the compound. These are usually either ions or molecules and different rules apply to each.

It is often necessary to distinguish between compounds in which the same elements are present in different proportions. Chemists have long used Latin and Greek roots to designate numbers within names. 

Two-element compounds are usually quite easy to name because most of them follow the systematic rule of adding the suffix -ide to the root name of the second element, which is normally the more "negative" one.

For rather obscure historic reasons, some of them have common names that begin with -bi which, although officially discouraged, are still in wide use for example,

HCO3–	hydrogen carbonate	bicarbonate
HSO4–	hydrogen sulfate	bisulfate
HSO3–	hydrogen sulfite	bisulfite

Most of the cations and anions can combine to form solid compounds that are usually known as salts. The one overriding requirement is that the resulting compound must be electrically neutral: thus the ions Ca²⁺ and Br ^– combine only in a 1:2 ratio to form calcium bromide, CaBr₂. Because no other simplest formula is possible, there is no need to name it "calcium dibromide".

Since some metallic elements form cations having different positive charges, the names of ionic compounds derived from these elements must contain some indication of the cation charge. The older method uses the suffixes -ous and -ic to denote the lower and higher charges, respectively.

C.

The most common oxygen-containing anions (oxyanions) have names ending in -ate, but if a variant containing a small number of oxygen atoms exists, it takes the suffix -ite.

How many oxygen atoms an "-ite" represents depends on the primary atom. All you get from the -ite/-ate relationship is that -ate has one more O than -ite. 

 In other words, if you have two ions, the one with more oxygens is 'ate' and the one with less is 'ite'. 

source:

http://www.chem1.com/acad/webtext/intro/nomen.html

http://arstechnica.com/civis/viewtopic.php?f=26&t=106035

Feiyi  2-1a

How to use ipad in the class

1.Students learn with their teachers and take a class on iPhone and mobile development, working on an iPad app for your school.

2.Teach students how to prepare professional presentations, using multimedia learning principles. 

3.Use ipad set up a class Twitter account to keep track of activities throughout the school year.

4.Creating an online resource guide for the iPad and school activities using Google Sites.