If you go out to the fields at night in spring or summer, you can hear frogs singing{#blank#}1{#/blank#}(joy) here and there. It seems as if they were performing a field symphony（交响乐）.

    The frog is a good and useful creature that benefits human beings. They can catch fast-moving insects. Each frog eats a large number of pests that are {#blank#}2{#/blank#}(harm) to crops. This little creature is regarded {#blank#}3{#/blank#}“the natural enemy of pests”.

    {#blank#}4{#/blank#} now frogs are getting fewer and fewer. This is{#blank#}5{#/blank#}they are killed and put on the table as a delicious dish by their chief enemy, human beings. It is a shameless and cruel act, isn't it? Another reason responsible for the rapid reduction of frogs is {#blank#}6{#/blank#}farmers use insecticides (杀虫剂) to kill pests and frogs get {#blank#}7{#/blank#}(kill)as a result of drinking poisoned water or eating poison-killed insects.

    Something must be done without delay {#blank#}8{#/blank#}(save) frogs. If we don't punish those {#blank#}9{#/blank#}sell and kill frogs to make money, then one day all of us {#blank#}10{#/blank#}(punish) by nature for failing to keep the balance of nature.

    There has been a recent trend in the food service industry toward lower fat content and less salt. This trend, which was started by the medical community(医学界){#blank#}1{#/blank#}a method of fighting heart disease, has had some unintended side{#blank#}2{#/blank#}(effect) such as overweight and heart disease—the very thing the medical community was trying to fight.

    Fat and salt are very important parts of a diet. They are required{#blank#}3{#/blank#}(process) the food that we eat, to recover from injury and for several other bodily functions. When fat and salt{#blank#}4{#/blank#}(remove) from food, the food tastes as if is missing something. As{#blank#}5{#/blank#}result, people will eat more food to try to make up for that something missing. Even{#blank#}6{#/blank#}(bad), the amount of fast food that people eat goes up. Fast food{#blank#}7{#/blank#}(be) full of fat and salt; by{#blank#}8{#/blank#}(eat) more fast food people will get more salt and fat than they need in their diet.

    Having enough fat and salt in your meals will reduce the urge to snack(吃点心) between meals and will improve the taste of your food. However, be{#blank#}9{#/blank#}(care) not to go to extremes. Like anything, it is possible to have too much of both,{#blank#}10{#/blank#}is not good for the health.

    John Snow was a famous doctor in London - so{#blank#}1{#/blank#}, indeed, that he attended Queen Victoria as her personal {#blank#}2{#/blank#}. But he became inspired when he thought about helping ordinary people {#blank#}3{#/blank#}to cholera.

    First there was England. Wales was{#blank#}4{#/blank#} to it in the thirteenth century. Now when people refer to England you find Wales {#blank#}5{#/blank#}as well. Next England and Wales were joined to Scotland in the seventeenth century and the name was changed to "Great Britain". Happily this was accomplished without{#blank#}6{#/blank#} when King James of Scotland became King of England and Wales as well.

    At first my new surroundings were difficult to{#blank#}7{#/blank#}. The air seemed thin, as though its combination of gases had little oxygen {#blank#}8{#/blank#}. Hit by a{#blank#}9{#/blank#} of fresh air, my head ached. Just as I tried to make the necessary {#blank#}10{#/blank#}to this new situation, Wang Ping appeared.

    Qian Zhongshu was a Chinese scholar and writer, known for his wit and erudition(博学). Despite failing in mathematics, Qian {#blank#}1{#/blank#} (success) entered the Department of Foreign Languages under Tsinghua University in 1929 because of his {#blank#}2{#/blank#} (excellence) performance in Chinese and English languages. In Tsinghua, he met his wife Yang Jiang, who was to become a successful playwright and translator, and {#blank#}3{#/blank#} (marry) her in 1935. In the same year, Qian received government sponsorship {#blank#}4{#/blank#} (promote) his studies abroad. Together with his wife, Qian headed for the University of Oxford in Britain. After {#blank#}5{#/blank#} (spend) two years at Exeter College, he received a bachelor of literature. He studied for one more year in the University of Paris in France, and he didn't return to China {#blank#}6{#/blank#} 1938.

    Qian lived in Shanghai from 1941 to 1945, {#blank#}7{#/blank#} was then under Japanese occupation. At that time he devoted {#blank#}8{#/blank#} (he) to writing and many of his works were written or published then. A collection of short {#blank#}9{#/blank#} (essay), Writing in the Margins of Life, was published in 1941. His most celebrated work Fortress Besieged appeared in 1947. On the Art of Poetry, written {#blank#}10{#/blank#} classical Chinese was issued in 1948.

    Albert Einstein, the genius behind the theory of relativity, has recently been making headlines again. However, this time it is not for a new scientific breakthrough,{#blank#}1{#/blank#}for a handwritten note he gave a bellboy 95 years ago.

    In October 1922, Einstein was delivering a series of lectures in Japan{#blank#}2{#/blank#}he received a telegram informing him that he{#blank#}3{#/blank#}(award) the Nobel Prize for Physics. Though{#blank#}4{#/blank#}(please) at the news, the Nobel winner decided to continue with his Japanese trip instead of{#blank#}5{#/blank#}(head) to Stockholm to accept the honor.

    While in Tokyo, he penned{#blank#}6{#/blank#}note in German, saying “A quiet and humble life will bring more{#blank#}7{#/blank#}(happy) than the pursuit of success...” Perhaps he had no loose change to tip a bellboy coming to deliver the message, he gave him the note, and told him,“ Maybe if you are lucky, the note{#blank#}8{#/blank#}(become) more valuable than just a regular tip. ”

    Earlier this year, the bellboy's nephew decided to hand it to Jerusalem-based Winner's Auctions (拍卖) and Exhibitions. The note was then put up for auction,{#blank#}9{#/blank#}might bring the owner a surprising $1.56 million{#blank#}10{#/blank#}a European buyer. It was a record for an auction of a document in Israel and the wild-haired scientist deserved it.

    Recently researchers have found that singing in groups could have a positive impact on reducing anxiety and {#blank#}1{#/blank#} (depress). The research is from the University of East Anglia in the UK, in cooperation with a community singing group {#blank#}2{#/blank#} (call) Sing Your Heart Out. A research team conducted the study {#blank#}3{#/blank#}(examine) how singing with other people affects mental health. Researchers followed a group of people {#blank#}4{#/blank#} attended free {#blank#}5{#/blank#}(week) singing workshops for six months. They discovered that singing in groups was {#blank#}6{#/blank#} essential part in helping people recover from mental illness. In addition, it helped people feel {#blank#}7{#/blank#}(little) stressed, enhanced their mood and increased their confidence, social skills and feeling of well-being.

    Lead researcher, professor Tom Shakespeare, said: "We found that singing as part of a group contributes {#blank#}8{#/blank#} people's recovery from mental health problems." He added that: "All of the participants we spoke to reported positive {#blank#}9{#/blank#} (effect) as a direct result of taking part in the singing workshops. For some, it represented one component of a wider programme of support. For others, it {#blank#}10{#/blank#}(stand) out as key to their maintenance of health."