48．A　考查细节理解。从第二则中的“But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.”可知，脑子要比心脏更努力、更辛苦，所以答案选A项。

　　49．B　考查写作意图。从全文知，这是一篇医学科技类的文章，主要介绍了与我们人体相关的一些知识，所以B项能很好地概括全文。

　　阅读理解。

　　Columbus College , 241 Queen Elizabeth Drive ,Kowloon City

　　Memo

　　To:

　　All Staff

　　From:

　　Jackie Mock, Secretary; Sports Development Committee

　　Date:

　　May 20, 2010

　　A week ago, “Sports for Life” programmer was sent to the parents, requiring them to select a sport they wanted their child to play. Since then, our staff have received lots of calls from parents asking for more information about it . Here is a memo (备忘录) for your reference when you answer the phones.

　　Sports 1: Basketball.

　　We expect that this will be the most popular of the four sports. Therefore, students should be advised to sign up as soon as possible. Students will take a private bus to and from Kwan Tong Sports Park .To cover the cost of hiring a bus , each student will have to pay ＄10 each time. There will be four basketball courts available for our use with one teacher watching over each game.

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