Many animals recognize their food because they see it．So do humans．When you see

  Many animals recognize their food because they see it．So do humans．When you see an apple or a piece of chocolate，you know that these are things you can eat．You can also use other senses when you choose your food．You may like it because it smells good or because it tastes good．You may dislike some types of food because they do not look，smell or taste very nice．Different animals use different senses to find and choose their food．A few animals depend on only one of their senses，while most animals use more than one sense．

  Although there are many different types of food，some animals spend their lives eating only one type．The giant panda eats only one particular type of bamboo f竹子)．Other animals eat only one type of food even when given the choice．A kind of white butterfly will stay on the leaves of a cabbage，even though there are plenty of other vegetables in the garden．However，most animals have a more varied diet(多样化饮食)．The bear eats fruits and fish．The fox eats small animals，birds and fruits．The diet of these animals will he different depending on the season．

  Humans have a very varied diet．We often eat food because we like it and not because it is good for us．In countries such as France and Britain．people eat foods with too much sugar．This makes them overweight，which is bad for their health．Eating too much red meat and animal products，such as butter, can also be bad for the health．Choosing the fight food，therefore，has become an area of study in modem life．

49．We can infer from the text that humans and animals    ．

  A．eat entirely different food     B．are not satisfied with their food

  C．choose food in similar ways   D．depend on one sense in choosing food

50．Which of the following eats only one type of food?

  A．The white butterfly          B．The small bird

  C．The bear                   D．The fox

51．Certain animals change their choice of food when

  A．they are attracted by different smells   

B．the food color changes

  C．they move to different places         

D．the season changes

52．We can learn from the last paragraph that

  A．food is chosen for a good reason      

B．French and British food is good

  C．some people have few choices of food

  D．some people care little about healthy diet

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