Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
A．whenB．beforeC．whileD．since
C   

試題分析：考查連詞：A. when當(dāng)…時(shí)候B. before在…之前C. while當(dāng)…時(shí)候，然而，雖然，D. since既然，句意：一些人通過手機(jī)彼此聯(lián)系，然而一些人通過電子郵件聯(lián)系。選C。
點(diǎn)評：此題主要考查連詞的辨析，選擇連詞主要是看前后句的關(guān)系，因果關(guān)系用表因果的連詞，轉(zhuǎn)折關(guān)系用轉(zhuǎn)折連詞，并列關(guān)系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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