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1.First published in 1927, the charts remain an _______ source for researchers. A intelligent B indispensable C inevitable D identical 2. Please___ dictionaries when you are not sure of____ word spelling or meaning. A search B seek C inquire D consult 3. It ____ you to at least 50% off the regular price of either frames or lenses when you buy both. A credits B entitles C presents D tips 4. The __ at the military academy is so rigid that students can hardly bear it. A confinement B convention C discipline D principle 5. Doctors warned agaisnt chewing tobacco as a _____ for smoking. A succession B substitute C revival D relief 答案 1-5BDBCB 1.选B indispensable to do sth, indispensable for sth/ doing sth 不可缺少的,必需的 inevitable 不可避免的，必然发生的 identical同一的,identical to/with sb/sth与完全相同的 | 
