7．
When people think of water buffaloes，they often imagine wild and dangerous animals．But unless they are hurt or angered，water buffaloes are probably the gentlest farm animals in the world．Though they look scary，they are much like household pets．Unlike cattle（黄牛），they are quiet and have a natural fondness for humans．
Water buffaloes are so patient and gentle that there is no need to control them during milking．Because of the animal's calm nature，water buffaloes almost never have their horns（角） taken off．However，most cattle which are raised for their milk will have their horns taken off，when they are young．It will prevent them from hurting one another when they grow up．
Another common wrong idea is that water buffaloes can be raised only near water．Though they love to roll in muddy water，water buffaloes usually live and have babies in situations where there is not enough water to do this．However，several researchers report that water buffaloes who roll in muddy water do not need to be treated with insecticides（杀虫剂） because the mud （烂泥） coating that forms on their skin protects them from insects and parasites（寄生虫）．
Another untrue belief about water buffaloes is that they can live only in tropical （热带的）areas．Actually，buffaloes are able to live in a wide range of climates．Although they are most common in the tropics，water buffaloes were used to pull snowplows（雪犁） in parts of Europe many years ago．
34．Why are water buffaloes'horns not taken off？A
A．They don't use their horns to attack．
B．They can't have babies without the horns．
C．Taking the horns off is dangerous to humans．
D．Taking their horns off can kill the buffaloes．
35．The writer seems to think that most cattleB．
A．don't give milk
B．are not gentle
C．make good pets
D．like people
36．According to the passage，how can rolling in muddy water help water buffaloes？A
A．It protects them from parasites．
B．It washes insecticides off them．
C．It helps them have more babies．
D．It keeps them cool in hot weather．
37．Which of the following statements best expresses the main idea of this passage？B
A．People used to keep water buffaloes as household pets．
B．Many people have incorrect ideas about water buffaloes．
C．Water buffaloes used to be common around the world．
D．Water buffaloes and cattle have many similarities．
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