阅读下列短文，根据短文内容选择最佳答案。

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    Flying is a fast way to travel. But it is a big headache for some people. They can't help worrying about things like, “Is turbulence (颠簸) a bad thing?” or, “Is it dangerous if we don't change our mobile phones to flight mode (飞行模式)?” British newspaper Daily Mail spoke to some experts to answer these questions. They also tell us other interesting things about flying.

    Is turbulence dangerous?

    It's scary and uncomfortable. But it is not something you really need to worry about.

    Turbulence is caused when two groups of air hit one another at different speeds. Wind, thunderstorms (暴风雨) and being close to mountains can be reasons for this.

    You may feel like turbulence is dangerous, but it won't crash (坠毁) your plane. “Even in extremely rough air (扰动气流), the wings (机翼) are not going to break off,” explained Patrick Smith, an airline pilot, who is also an air travel blogger and author of Ask The Pilot. com.

    Why are plane windows round?

    Round windows are for passenger safety.

    As the airplane flies higher and higher, the outside atmospheric pressure (气压) gets lower and lower. During the flight, the pressure inside the plane becomes greater than the pressure outside.

    When this happens, square windows can break. That's because having different pressures inside and outside puts pressure on the corners of square windows. But rounded corners can spread the pressure through the window.

    What happens when a phone isn't on flight mode?

    Some passengers believe mobile phones and tablets need to be turned off because they could bring the plane down. However, this is not true.

    If you don't change your phone to flight mode, pilots and air traffic controllers may hear unpleasant sounds in their headphones. It also influences radio communications. So it's still best to put it on flight mode.

从下列材料中提取要点，整合成一个句子，对“转基因棉花”作一解说。
某公司向市场推出一种崭新的产品——转基因棉花，或称BT棉。BT棉是存在于细菌——苏云金芽孢杆菌中的一种基因，这种基因合成的一种蛋白质具有杀死某些毛虫的性能。科学家已经从该细菌中分离出这种基因，并将这种基因植入棉花种子中，使棉花获得抗天敌烟草夜蛾幼虫的性能。这一新型转基因棉花的产生，从根本上消除了传统喷洒杀虫剂使害虫产生耐药性的弊端，从而使棉花大量增产成为可能。
转基因棉花指的是____。

福娃是北京2008年奥运会吉祥物，著名艺术家韩美林是2008年奥运会吉祥物创作修改组的组长，他曾经说过：“你知道吗？经历了五六次设计人员的变动，五六十次设计方案的改动，画了四五千张设计草图，这5个小'福娃'才得以诞生。”从他的话里，我们最应该得出的结论是（   ）

    I don't like____ .

He didn't go to school yesterday ________ he was ill.