D．over；through；across

　　解析　考查介词。across横过，穿过；over从某一物体上方越过；through穿过，从……中通过。

　　答案　A

　　14．Along with the letter was his promise________he would visit me this coming Christmas.

　　A．which

　　B．that

　　C．what

　　D．whether

　　解析　考查名词性从句。that引导的从句说明的是promise的内容，因此是同位语从句，that在句中不作成分。

　　答案　B

　　15．Peter was so excited________he received an invitation from his friend to visit Chongqing.

　　A．where

　　B．that

　　C．why

　　D．when

　　解析　考查状语从句。when引导时间状语从句。

　　答案　D

　　Ⅱ.阅读理解

　　Rather than using cellphones to just snap photos of friends or the occasional celebrity sighting, phone users in California may get the chance to track levels of harmful black soot near their workplaces and homes.

　　Tech companies created a simple circular filter that darkens over time as it absorbs black soot. Anyone with a basic cell phone camera can take a picture of the filter next to a calibration chart (校准图表) that reflects different black soot pollution levels－ no smart phones required.

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