解答 答案：Take． 祈使句+and+陳述句相當于肯定的if條件句+陳述句，祈使句一般要用動詞原形來填空，本句相當于If you take more exercise，you'll become healthier．所以空格處需要用動詞原形來填空，又因為空格位于句首，所以首字母要用大寫，故填Take．
2．I've been working as a professional clown（小丑）for nearly two years．Before that，I was an actor for nine years．I was never famous，but I was quite successful!I changed jobs because I wanted to do more in life than make people laugh．What if I could help people，too？ As a clown，I try to encourage sick children in hospital to laugh and smile．When you laugh，your mind and body relax．Clearly，people who laugh more don't have as many colds or other problems!Children who laugh a lot often get better results in their studies，too． It isn't an easy job．Not all sick children get better，and sometimes I come home and cry．But I always go back to work the next day with my red nose on．l don't earn much money as a clown，but I feel very lucky to work with such brave and wonderful patients． 2 I became a laughter yoga（瑜伽）teacher more than two years ago．Before that，I was a dentist!My job was very difficult，and I used to feel fed up．Now I still improve people's health，but everything else is completely different．Everyone has fun in a laughter yoga class，including the teacher! No，laughter isn't"magic"．It doesn't prevent all illness，keep you young，or make you beautiful．But did you know that it's an excellent kind of exercise？You move your whole body when you laugh! Sometimes I work with famous people．It's true that being rich can be stressful!Some famous people can be unpleasant at times，but I try to change their bad feelings．Laughter is excellent for people like musicians，artists and writers，because it helps people to be more creative． 26．According to the passage，we can see that both writersA• A．have changed their jobs B．like sports very much C．feel unhappy at work D．are looking for jobs 27．The second writer mentions famous people in the passage to show thatB• A．they are always rich B．they have stress sometimes C．they like funny people D．they are good at doing yoga 28．The underlined part"fed up"is closest in meaning toD• A．interested B．satisfied C．relaxed D．bored 29．It can be learned from the passage that both writers think of their jobs asD• A．happy moments to learn from other people B．great chances to make themselves well known C．rich experiences of acting on the stage D．good ways of making people happy and healthy．
10．All living things on the earth need other living things to live．Nothing lives alone．Most animals must live in a group，and even a plant grows close together with others of the same kind．Sometimes one living thing kills another，one eats and the other is eaten．Each kind of life eats another kind of life so that it can live，and together they form （形成）a food chain （鏈）．Some food chains are simple，while others are not．However，all food chains begin with the sun，and all food chains become broken up if one of the links（連接）disappears． All life needs sunlight（陽光）to live on，but only plants can use sunlight directly （直接地）．Plants are"factories"．They make food from sunlight，water and things in the soil （土壤）and air．Plants feed all other living things．Animals can only use the sun's energy after it has been changed into food by plants．Some animals feed directly on plants，while others eat smaller animals．Meat-eating animals are only eating plants indirectly（間接地）． What about people？We are members of many food chains．We eat rice，vegetables，fruits and so on．We also eat meat and drink milk．However，people often break up food chains．They kill wild animals，fhey also make rivers，lakes and seas dirty．When these rivers，lakes and seas are polluted，the fish in them cannot be eaten．If people eat the fish，they will be sick．Each form of life is linked to all others．Breaking the links puts all life in danger．
46．How does every living thing on the earth live？B． A．Each plant can live alone． B．Every living thing on the earth can not live without others． C．Each animal can live alone． D．If living things want to live，they must kill all others． 47．Which living things can use the sun's energy directly？A． A．Plants． B．Animals． C．Both animals and plants． D．All living things． 48．What do plants make food from？They make food fromD． A．water，sunlight and things in the air B．water and things in the soil and air C．water，sunlight and things in the soil D．sunlight，water and things in the soil and air 49．Who often break up the food chains？D． A．Animals． B．Plants and animals． C．People and wild animals． D．People． 50．Which of the following is the best title for this passage？C． A．Plants B．Animals C．Food Chains D．Living Things．
