【題目】 Your teeth may be part of your smile,_______they have a more important job—they are the first step in the process of digestion. You have three _________(kind) of teeth. In the very front of your mouth are eight flat, thin teeth called incisors. They are used for cutting and biting food. Next to these are pointed teeth called canines, _________ also help you tear food. The remaining teeth are molars. These teeth have flat tops for crushing and grinding the food.

【答案】

【1】but

【2】kinds

【3】which

【解析】

這是一篇說明文。介紹了牙齒的三個(gè)種類和功能。

【1】考查連詞。句意：你的牙齒可能是你笑容的一部分，但是他們有一個(gè)更重要的工作：它們是消化過程的第一步 �？崭裉幥昂鬄閮蓚�(gè)完整的句子，所以要填一個(gè)連詞連接這兩個(gè)句子，根據(jù)句意，前后為轉(zhuǎn)折關(guān)系，故填but。

【2】考查名詞單復(fù)數(shù)。句意：你有三種牙齒。kind在這里表“種類”，是可數(shù)名詞，由three修飾，所以要用其復(fù)數(shù)形式。故填 kinds。

【3】考查非限定性定語從句。句意：這些牙齒旁邊是犬齒，這些犬齒也可以幫助你撕裂食物。分析句子可知，空格處所在的句子為定語從句，先行詞為canines,指物。關(guān)系詞在從句中做主語。所以要用which引導(dǎo)這個(gè)非限定性定語從句 ，故填which。

定語從句分為限制性和非限制性兩種。限制性定語從句不可缺少先行詞，去掉它主句意思往往就不明確了，它與主句之間通常不用逗號(hào)分開；非限制性定語從句是對(duì)先行詞的附加說明，去掉它也不會(huì)影響主句的意思，它與主句之間通常用逗號(hào)分開。限制性定語從句的先行詞往往是某一個(gè)詞，但非限制性定語從句的先行詞可以是一個(gè)詞，也可以是句子的一部分，甚至是整個(gè)主句。并且that 不可引導(dǎo)非限制性定語從句。

第3小題中，根據(jù)上述區(qū)別可以看到從句與主句之間用逗號(hào)分開，由此判斷空格處引導(dǎo)的是非限定性定語從句。分析可知先行詞為canines,指物，關(guān)系詞在從句中做主語，只能用which引導(dǎo)這個(gè)非限定性定語從句。

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