The first wild animals taoled（驯服）by humans were dogs．This （A）________in Europe about 10,000 years ago.

    The first “dogs” were like the ones we have now．Maybe they were small wolves（狼）or a type of dog like the Australian dingo（澳洲野狗）．

    These dogs probably came near humans to get some food．Some of their puppies（幼犬）were caught by people and grew up with （B）them．These puppies were quite tame as they grew up.（C）They thought humans were part of their group!

    Humans realized the dogs were very （D）helpful to them in（E） a number of ways．The dogs helped people hunt（打猎）．They could smell and hear danger before people could．They helped keep people（F）________on cold rights．It was fun to have them!

    Over a long time, people were able to keep the dogs for different purposes．Some were for hunting；some for herding（放牧）; and some just for pets．These dogs looked quite different from each other．For example，a German Shepherd looks a lot different from a Yorkshire terrier!

  （G）It is said that世界上有400多种犬．Today．dogs depend on human more than any other animals．

1．在文中（A）和（F）的空白处分别填入一个适当的词语： ________；________

2．在文中（B）和（C）处分别指代：________；________

3．写出划线部分（D）和（E）的同义词或近义词：________；________

4．将文中（G）处划线部分句子译成英语：________________________

5．从文中找出能说明本文中心大意的句子：________________________