2013年英语四级考试完形填空全真练习（2）_第4页

　　[B] excludes

　　[C] dissolves

　　[D] involves

　　83. [A] explosion

　　[B] exposure

　　[C] extension

　　[D] expansion

　　84. [A] endangered

　　[B] inspired

　　[C] harmful

　　[D] frustrated

　　85. [A] established

　　[B] created

　　[C] constructed

　　[D] built

　　86. [A] isolate

　　[B] apart

　　[C] refrain

　　[D] remove