阅读理解

C

　　“Travelling by subway (地铁) is much faster. It not only takes me a few minutes to get to my office, but also I don't worry about traffic jam.” a passenger says. A lot of people like taking the subway. It is a kind of popular way and more convenient in our daily life. It has three advantages (优点). First, it's fast. The subway can run about 80 kilometres in an hour. It's much faster than riding a bike or taking a bus. Second, it's accurate. It can help you get somewhere on time. Don't worry about the weather. It can arrive on time even if it is raining or snowing. During rush hour (交通高峰期), there is a subway every five minutes. You can't wait too long. Finally, it is comfortable. It is very comfortable for passengers to take the subway. You can find place to sit or stand here and there. They don't feel cold in winter or hot in summer because of the air-conditioners (空调). It can carry many people. I think most of people all like it. You will have a good time to take the subway.

                                                                               寒   食①

                                                                               孟云卿
                                                             二月江南花满枝，他乡寒食远堪悲。
                                                             贫居往往无烟火，不独明朝为子推。
【寒食】节令，清明前一天。太原、上党、西河、雁门等地为纪念介子推，每年冬至后一百五日禁火寒食，俗称寒食节。

在移栽植物时，将一种无色的喷剂喷洒到叶面上，能结一层薄膜，这层膜可以让二氧化碳通过而水分子不能通过，从而提高移栽植株的成活率。这类物质的作用是（  ）