单选题 Extreme exercise is any activity taht increases your heart rate and the amount of oxygen that your muscles burn.

单选题 If you want antibiotics, you'll have to ask the doctor for a ____________.

单选题 Why don't you start playing tennis ? It will help you keep fit and it's a great______________ .

单选题 Peter is not fit. He felt as if he couldn't __________ afer he ran only 100 metres.

单选题 More and more people who live or work close to mobile phone masts get muscle aches, headaches, hear problems and stomachaches.

单选题 If you go to school by bus, why not get off the bus two or three stops early and walk the rest of the way?

单选题 You don't have to be a ____________ fanatic and give up everything you enjoy.

单选题 If you want to stay fit, don't eat too much and take plenty of ___________ .