Today is Saturday. Jim doesn't have to go to school. And Mom will take him to the supermarket (超市). So he is very happy.

    “Mom, can you buy me a basketball, please?” Jim asks.

    “OK,” Mom says.

    Jim takes his hat and goes out with his mom. They get to the supermarket soon. It is very big, and many things are on sale. The basketball is very cheap (便宜的). It's only 35 yuan. So Jim buys two. One of them is for his good friend Mike, because Jim wants to go to Mike's house (房子) and play with him after lunch. Well, Mike must be very happy to get the basketball. And the two friends will play basketball and watch TV in the afternoon.

阅读表达。阅读上文，根据其内容完成下列各小题。

阅读下列材料，回答问题。

材料一：“滚滚长江东逝水，浪花淘尽英雄，是非成败转头空，青山依旧在，几度夕阳红。……古今多少事，都付笑谈中。”

——电视连续剧《三国演义》主题歌

材料二：大江东去，浪淘尽，千古风流人物。故垒西边，人道是三国周郎赤壁。乱石穿孔，惊涛拍岸，卷起千堆雪。江山如画，一时多少豪杰。遥想公谨当年，小乔初嫁了，雄姿英发。羽扇纶巾，谈笑间，樯橹灰飞烟灭。故国神游，多情应笑我，早生华发。人生如梦，一樽还酹江月。

——苏轼的《念奴娇•赤壁怀古》

When I as well as my cousins __________ as a volunteer in Beijing, I saw the Water Cube twice.

2014年11月16日，被称为“黄金通道”的兰新高铁新疆段通车，新疆正式迈入高铁时代，开启“新丝绸之路”向高铁时代迈进。这表明（   ）

我们知道：sin30°=$\frac{1}{2}$，tan30°=$\frac{\sqrt{3}}{3}$，sin45°=$\frac{\sqrt{2}}{2}$，tan45°=1，sin60°=$\frac{\sqrt{3}}{2}$，tan60°=$\sqrt{3}$，由此我们可以看到tan30°＞sin30°，tan45°＞sin45°，tan60°＞sin60°，那么对于任意锐角α，是否可以得到tanα＞sinα呢？请结合锐角三角函数的定义加以说明．