按要求分类，把图画在方框里．

a．按大小分类：

b．按形状分类：

两种气态烃组成的混合物6.72L（标准状况），完全燃烧生成0.48molCO₂和10.8gH₂O，则该混合烃中一定含有____ （化学式），若另一种烃一定条件下最多能与等物质的量的H₂完全加成，则该烃的名称为____．

学生的早、午、晚三餐摄入的热量比例，比较符合健康要求 的是（　　）

阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
Live Music—-Late Night Jazz
    Enjoy real American jazz from Herbie Davis, the famous trumpet(号手). He is known to play well into the early hours, so don't want to get much sleep.

PLACE: The Jazz Club     DATES: 15—-23 June PRICE: ￥100-150        TIME: 10 p.m. till late!   TEL: 4668736

Scottish Dancing
    Scottish dancing is nice and easy to learn. The wonderful dance from England will be given.

PLACE: Jack Stein's      DATES: 10-20 May PRICE: ￥150           TIME: 7-10 p.m.  TEL: 4021877

Shows—-Anhui Museum
    There are 12,000 pieces on show here. You can see the whole of Chinese history.

PLACE: Anhui Museum    DATES: 1Mar-30 Jun PRICE: ￥130            TIME: Mon-Fri 9 a.m-5 p.m.   Saturday 9 a.m.-9 p.m. TEL: 4886888

    Your pen friend is coming from Australia to your city for a holiday. You send him this E-mail to tell him something about the hotels.

SUN HOTEL Dates                Prices(a night) 1Oct-31Dec             ￥168 1Jan-31Mar             ￥148 1Apr-30Apr(closed)       …… 1May-31May            ￥188 1Jun-30Sep              ￥208 TEL: 4686788   E-mail: Li Hong@163.com.

ROSE HOTEL Prices(a night) ￥198 ￥178 …… ￥218 ￥248

随着苹果公司推出新一代手机iPhone5，iPhone4S的价格也随之下降，降幅在人民币千元以上。iPhone4S降价的根本原因是(　　)