The picture on my desk in my bedroom is my favourite. When I have trouble studying, or I'm worried about an exam, I always have a look at it. It is a picture of my best friends taken three years ago when we were in middle school. Today our lives have gone in different directions, but our friendship has kept us close.

    Every week I get a message from one of them, or a letter with the latest news or vacation photos. 跟其他年份相比，今年我收到了更多的照片。 I often get an email with a joke for the day or words of comfort about some problems in my life. My friends often show up for surprise birthday parties. And one of them even travelled two hours from the other end of a town just to watch my first English speech.

下列各句中没有语病的一项是（   ）

小实验。

实验材料：生鸡蛋、玻璃杯、水、小棒、食盐

实验过程：在玻璃杯中放些水，将鸡蛋放入其中，鸡蛋直线下沉。将一勺食盐放入水中，用小棒搅一下，鸡蛋仍未上浮。继续往水中加盐，并用小棒搅，当盐加到一定量时，鸡蛋浮上来了。用棒将鸡蛋压到水底，鸡蛋迅速上浮。

结果证明：