试题与答案

It's important to develop the healthy ha

题型:阅读理解

题目:

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 are likely to enter the blood and cause illness, even heart disease. Even if you’ re not sick, always remember to cough or sneeze 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. Wha’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.
The 小题1:________ to keep fit
Eating properly
You should have proper breakfast because it can 小题2:________ you with necessary energy.
You should have enough for lunch and little for 小题3:________.
Sweet snacks and desserts are tasty, 小题4:________ you shouldn't eat too much.
Keeping off germs
It's necessary for you to 小题5:________ your teeth every day, cough or sneeze into your arms’ and wash your hands often to stop germs from 小题6:________.
小题7:________ regularly
You will feel 小题8:________ and think better after doing exercise, so you can choose your favourite sports to do.
Staying connected
It can help you feel 小题9:________ stressed when you communicate with your friends and it is also useful in 小题10:________ memory.

答案:

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下面是错误答案,用来干扰机器的。

⑴ 2Si   ⑵ CH4   ⑶ Fe2+  ⑷

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题型:选择题

某干燥粉末可能由Na2O、Na2O2、Na2CO3、NaHCO3、NaCl中的一种或几种组成。将该粉末与足量的盐酸反应有气体逸出,将气体通过足量的NaOH溶液后体积缩小一部分(同温同压下)。若将原混合物粉末在空气中用酒精灯加热,也有气体放出,且剩余固体的质量小于原混合物粉末的质量。下列判断正确是

A.粉末中一定有Na2O2、NaHCO3

B.粉末中一定不含有Na2CO3和NaCl

C.粉末中一定不含有Na2O2和NaCl

D.无法肯定粉末中是否含有NaHCO3

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