Endurance
Endurance exercis increa your breathing and heart rate. By doing endurance exercis, you are working to keep your heart, lungs, and blood-flow system healthy while improving your total fitness.Over time the activities will make everyday activities em easier.
Strength
If you want to build up your muscles, then strength exercis, which are also known as "resistance training", are right for you. Even the slightest increa in strength can make a huge difference in your ability to carry out daily tasks. Developing strong muscles also reduces your risk of weak bones.
Flexibility
permitsFlexibility exercis help stretch your body's muscles. This allows for more freedom of movement for other exercis and can also improve your range of motion, posture,ability to breathe deeply, and blood flow. Also, it reduces the muscle tension caud by stress.
Balance
Balance exercis help prevent falls and are especially important to older adults, helping them stay independent. Most good balance exercis are ones that keep you constantly moving with your feet on the ground. Heel-to-toe walking and standing on one foot are simple ways to improve balance.
21. How can a person benefit most from their exerci routine?
A. By combining different exerci types together
B. By having sufficient rest between their workouts
C. By concentrating on one training aspect at a time.
D. By increasing the frequency of their training gradually.
22. Which exerci types are most uful to improve a person's breathing function?
A. Strength and Balance B. Flexibility and Balance
C. Endurance and Strength D. Endurance and Flexibility
23 Which part of the body plays the most important role in balance-related exercis?
A.Arms. B. Legs. C. Waist D. Neck
B
The history of microbiology begins with a Dutch cloth maker named Antoni van Leeuwenhoek,a man of no formal scientific education. In the late 1600s, Leeuwenhoek, inspired by the magnifying lens(放大镜) he ud to examine cloth, built some of the first microscopes. He developed a technique to improve the quality of tiny, rounded lens, some of which could magnify an object up to 270 times.After removing some plaque from between his teeth and examining it under a lens, Leeuwenhoek found tiny twisting creatures, Which he called"animalcules"".
His obrvations, which he reported to the Royal Society of London, are among the first descriptions of microbes(微生物), Leeuwenhoek discovered an entire univer invisible to
the human eye. He found different microbes in samples of pond water, rain water, and human blood. He gave the first description of red blood cells, obrved plant tissue, examined muscle, and investigated the life cycle of incts.
Nearly two hundred years later, Leeuwenhoek's discovery of microbes helped French chemist and biologist Louis Pasteur to develop his"theory of dia". This concept suggested that dia originates from tiny organisms attacking and weakening the body. Pasteur’s theory later helped doctors to fight infectious dias including anthrax, diphtheria, polio, smallpox, tetanus, and typhoid. All the breakthroughs were the result of Leeuwenhoek's original work. Leeuwenhoek did not foree this legacy.
春节英语作文In a 1716 letter, he described his contribution to science this way: "My work, which I’ve done for a long time, was not pursued in order to gain the prai I now enjoy, but chiefly from a strong desire for knowledge, which I notice resides in me more than in most other men, And therefore,whenever I found out anything remarkable, I have thought it my duty to put down my discovery on paper, so that the scientific community might be informed thereof.”ts什么意思
