People cut down too many trees, _____ the greenhouse effect becomes more and more serious.

A．soB．becauseC．a(chǎn)lthoughD．if

A

解析試題分析：so 因此；because 因?yàn)椋籥lthough雖然，盡管； if是否，如果。句意：人們砍伐了太多的樹木，因此溫室效應(yīng)變得越來越嚴(yán)重。結(jié)合語境可知選A。
考點(diǎn)：連詞辨析
點(diǎn)評：連詞在句子中主要起聯(lián)系上下文的作用，他們之間的區(qū)別就是表示邏輯關(guān)系的不同，所以在解題時(shí)先要理解上下文含義，然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞。連詞的用法都比較多，語義之間還有交叉，熟記其基本應(yīng)用規(guī)則，了解其區(qū)別，注意固定搭配對象，是做好此類題型的關(guān)鍵。

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