题目内容
11．We must be friendly ___________ the old．（ ）| A． | for | B． | to | C． | over | D． | about |
分析 我们必须对老人友好．
解答 答案：B．考查常用介词的辨析．句意：我们必须对老人友好．be friendly to sb 表示对某人友好/友善．根据题干We must be friendly ___________ the old．可知应说我们必须对老人友好．故选B．
点评 掌握一些固定用法，根据具体内容作答．
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14．
What's the cleverest bird in the world？Most scientists say it's the
raven（渡鸦）．They can change their behavior to solve new problems．
For example，if they can't find one kind of favorite food，they learn to
eat something else．Their food can be small animals，fruit，eggs and rubbish．Because they eat so many different foods，they can live in lots of different places around the world：deserts，mountains，forests，cities，and the cold Arctic（北极）．
The size of a raven's brain may help explain why the bird is so clever．Its brain is much bigger than other birds'．For example，a raven's brain is five times as big as a chicken's although a chicken weighs twice as much as a raven．
Sometimes a raven can be too clever．A scientist names Konrad Lorenz kept a raven named Roah．One day，Roah picked up some wet clothes that had fallen off Dr．Lorenz's clothesline （晒衣绳）．The scientist gave the helpful bird some food．After that，Roah gave the scientist a lot of wet clothes from his neighbors'clotheslines!
What's the cleverest bird in the world？Most scientists say it's theraven（渡鸦）．They can change their behavior to solve new problems．
For example，if they can't find one kind of favorite food，they learn to
eat something else．Their food can be small animals，fruit，eggs and rubbish．Because they eat so many different foods，they can live in lots of different places around the world：deserts，mountains，forests，cities，and the cold Arctic（北极）．
The size of a raven's brain may help explain why the bird is so clever．Its brain is much bigger than other birds'．For example，a raven's brain is five times as big as a chicken's although a chicken weighs twice as much as a raven．
Sometimes a raven can be too clever．A scientist names Konrad Lorenz kept a raven named Roah．One day，Roah picked up some wet clothes that had fallen off Dr．Lorenz's clothesline （晒衣绳）．The scientist gave the helpful bird some food．After that，Roah gave the scientist a lot of wet clothes from his neighbors'clotheslines!
| The cleverest bird in the world--raven | |
| Food | Small animals，fruit，（51）eggsand rubbish． |
| Living places | （52）deserts，mountains，forests，cities，and even the cold Arctic． |
| Special part of its body | A big brain（53）fivetimesas big as a chicken's）． |
| An example | Konrad Lorenz's raven（54）pickedupsome wet clothes for him and Konrad gave it（55）somefoodas a prize．After that，the raven gave him lots of wet clothes from his neighbors'clotheslines． |
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