It's important to develop the healthy habits in your daily life. The following will help you become healthier and keep perfect shape.

    Eat properly. A healthy diet is very important for everybody. Breakfast is the most important meal in a day. Doctors suggest that students' breakfast should include fruit, eggs, milk, rice or noodles, because these can offer them necessary energy, help them listen carefully in class and keep them healthy. Eat enough for lunch and little for supper. But remember that too much sugar is bad for your teeth and blood. You shouldn't have too many sweet snacks and desserts in your diet, even though such food tastes delicious.

    Keep off germs(病菌). Daily tooth cleaning reduces the amount of germs which will spread diseases. Germs in the mouth arc likely to enter the blood and cause illness, even heart disease. Even if you're not sick, always remember to cough or into your arms instead of your hands because hands can spread germs to others when you touch something else. Besides, washing hands is necessary after going to the toilet or before having a meal. And you'd better rub both hands while washing them.

    Exercise regularly. Regular exercise can improve your moods and balance. What's more, it's good for bones. There are many forms of exercise: walking or running for about 30 minutes a day playing ball games twice or three times a week, swimming or dancing often. You can choose your favorite to practise regularly. You will not only feel energetic but also think better after doing exercise.

    Stay connected. Having regular communication with friends is the key to reducing stress. And sharing happiness and sadness, exchanging information with others can also help improve memory. Having a friend or a circle of friends can help you feel good.

1842年，中国被迫签订中英《南京条约》，标志着中国沦为了半殖民地半封建社会。（   ）

在下面一段文字横线处补写恰当的语句，使整段文字意义完整连贯，内容贴切，逻辑严密。每处不超过12个字。

    科学技术是把双刃剑，它在给人类带来便利的同时，①____。电磁波就是这样，一方面无线通信信息要靠它来传输，但另一方面，②____。电磁辐射具有很强的穿透力，能够穿透包括人体在内的多种物质，能够透过人的体表深入深层组织和器官，③____。