英语

　　1. We normally ( ) exchanges for all purchases, but we have no more of this design in stock.

　　A. have offered

　　B. are offered

　　C. are offering

　　D. offer

　　【答案】D。句意为：通常，我们会为所有购买提供交换，但库存中没有更多这种设计。normally和but后的时态可知应用一般现在时。所以答案选D。

　　2. Production has been ( ) from our Boston site to a new industrial center outside of Portland.

　　A. swept

　　B. swapped

　　C. switched

　　D. swung

　　【答案】C。句意为：生产已经从我们的波士顿工厂转移到波特兰郊外的新工业中心。A.打扫;B.交换;C.改变;D.摆动。所以答案选C。

　　3. In old Industrial areas across the United States, immigration is the for ( ) economic growth.

　　A. principle

　　B. background

　　C. theory

　　D. basis

　　【答案】D。句意为：在美国老工业区，移民是经济增长的基础A.原则;B背景;C.理论;D.基础。所以答案选D。