在英语越发普及的21世纪，英语成了大学生的必修课。为帮助大家掌握权威的英语知识，特提供以下资料：
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
谜底
1-5BDBCB
1.选B indispensable to do sth, indispensable for sth/ doing sth 不成缺傲幽,必需的
inevitable 不成避免的，必然发生的
identical统一的,identical to/with sb/sth与……完全不异的
2.选D consult with sb 与某人筹议,consult查阅
3. 选B entitle sb to sth(用于被动语态) 给某人获得某事物或权力
4. 选C discipline 练习体例,赏罚
confinement限制，禁锢
convention大会
5.选B substitute 庖代, 替用品
revival恢复，清醒