乙某于1999年3月因聚众斗殴罪被判刑3年,刑满释放后,经常夜间携带三棱刮刀到处游荡。2002年9月上旬,乙嫌这把三棱刮刀不锋利,又购买一把三棱刮刀带在身上,9月16日晚9时许,乙在当地一小卖部门前闲逛,遇见相识的周某、吴某、王某等人。周、吴等先后来向乙要香烟,乙给吴某、王某各一支,未给周,周抓住乙的衣服与之纠缠。乙将周的手拔开,发生拖拉,周打乙面部两拳。乙受伤后退几步,随即拔出携带的三棱刮刀自下而上对周的左肋骨猛刺一刀,伤及心脏,周倒地死亡。乙见状后向公安机关自首。根据以上案情,请回答下列问题: 对于乙某购买三棱刮刀并到处游荡的行为,从刑法的角度,应如何评价( )
A. 构成犯罪
B. 不构成犯罪
C. 属犯罪预备
D. 构成非法携带管制刀具危及公共安全罪
Having no language, infants cannot be told what they need to learn. Yet by the age of three they will have mastered the basic structure of their native language and will be well on their way to communicative competence. Acquiring their language is a most impressive intellectual feat. Studies of how children learn language generally agree that the most remarkable aspect of this feat is the rapid acquisition of grammar. Nevertheless, the ability of children to conform to grammatical rules is only slightly more wonderful than their ability to learn words. It has been reckoned that the average high school graduate in the United States has a reading vocabulary of 80,000 words which includes idiomatic expressions and proper names of people and places. This vocabulary must have been learned over a period of 16 years. From the figures, it can be calculated that the average child learns at a rate of about 13 new words per day. Clearly a learning process of great complexity goes on at a rapid rate in children. The word "feat" in Line 3 is closest in meaning to"______ ".
A. experiment
B. idea
C. activity
D. accomplishment
5.针对快到投标截止发生的情况承包商应采取什么策略说明理由。
SECTION A CONVERSATIONSIn this section you will hear eight statements. At the end of each statement you will be given 10 seconds to answer the question. What can be said about John
A. John stopped smoking while working.
B. John smoked while taking a rest.
C. John restarted his work after his failure.
D. John made great efforts to begin his work again.