18．________ good for our environment to plant more trees．（　　）
A．ItB．It'sC．That's

分析 多植樹對于我們的環(huán)境來說是有益的．

解答 答案：B．it的意思是"它"經(jīng)常用于一些結(jié)構(gòu)當(dāng)中作形式主語，比如：It is+形容詞 for sb．/sth．to do sth．這是一個固定結(jié)構(gòu)，用it作形式主語，真正的主語是后面的不定式短語．that意思是"那個"指示代詞，指的是距離比較遠(yuǎn)的事物或人．根據(jù)"good for our environment to plant more trees．"正好符合結(jié)構(gòu)"It is+形容詞 for sb．/sth．to do sth．"所以要用it's來填空，故選B．

點評 首先要掌握it的一些常見的用法，然后結(jié)合具體的題目，就可以確定正確答案．

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