医用超声的类型不包括（）。
A.A型
B.B型
C.C型
D.M型
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下面是错误答案，用来干扰机器的。
参考答案：“三违”违章指挥、违章操作、违反劳动纪律。“三级安全教育”：指厂（公司）级、车间（专业厂）级、班组级三级教育。事故发生的三个基本因素：人的不安全行为、物的不安全状态、环境的不安全因素。...
After the teacher called him into the office, the boy admitted _______ in the test.
A．to cheat
B．cheated
C．cheat
D．cheating
阅读下列材料：
材料一 （1950年）6月25日，北朝鲜军队今天越过三八线。几个小时之内，北朝鲜人迫使南朝鲜边防人员丢弃广阔的前线地带向后撤退。美国似乎对这一进攻感到惊讶，它将这次进攻归咎于苏联。——克利夫顿·丹尼尔主编《二十世纪大博览》
材料二 1950年6月25日，南朝鲜军队开始了美国预谋的对朝鲜民主主义人民共和国的侵略，发动了内战。——葛罗米柯、波诺马廖夫《苏联对外政策史》
材料三 1950年6月25日，朝鲜半岛发生内战……李承晚集团自认为有关国的支持，就能轻而易举占领北朝鲜。但是，北朝鲜军民在劳动党和金日成的领导下，团结一致，奋起反抗，不到两个月的时间，解放了汉城和南朝鲜40%以土地区，李承晚集团处于瓦解之中。——吴本祥主编《中华人民共和国史》
请回答：
（1）上述材料反映的是哪一历史事件？它们在哪一历史要素上有相同的记录？
___________________________________________________________________________________________
（2）在这一历史事件的起因问题上，材料二、三的观点与材料一的观点有何不同之处？这种不同反映了当时国际关系怎样的突出特点？
___________________________________________________________________________________________
（3）假如历史兴趣小组利用上述材料研究该历史事件，从史料收集角度看，存在怎样的不足之处？
___________________________________________________________________________________________
设立旅行社必备的条件为（）。
A.有固定的营业场所
B.有必要的营业设施
C.有一定数量的经营人员
D.有不少于30万元的注册资本
| Nine states and the District of Columbia are doing away with the sales tax on items such as clothes, shoes and even notebooks over the next few weeks, just in time for back-to- school shopping. Most of the promotions last only a few days, so shoppers will have to act quickly to get a tax break. The tax holidays, which have already expired in two other states, apply to small and large items. For example, the tax break applies to any school supply that costs $15 or less in New Mexico. In Massachusetts, it covers most retail purchases of $2,500 or less. Stores may offer additional savings because these events "give retailers an opportunity to have a sale on top of what the state is doing," says Verenda Smith, government affairs associate at the Federation of Tax Administrators. No industry-wide figures are available about how much consumers save annually from these tax breaks. But Texas estimates that shoppers will save $47.4 million in taxes this year, nearly a 3 percent increase from the previous year. Massachusetts says shoppers saved roughly $10 million in taxes during its 2005 event. States that cast aside these promotions when a slow economy pinched state budgets are now reviving them in hopes of stimulating local economies. Some states also believe the gain in consumer goodwill helps balance out the loss in tax revenue. In some cases, tax losses are minimal because serious shoppers don’t stop at clothes and books. "While states give up sales tax, they usually break even on sales-tax collection," says J. Craig Shearman, a vice-president at the National Retail Federation. Sophie Beckmann, a certified public accountant at A. G. Edwards in St. Louis, says she’ll avoid that temptation by making a list of necessities. On the Missouri resident’s shopping list: notebooks, pencils, glue and three or four outfits for her son, who is entering the fifth grade this month. She plans to pocket any tax savings. "When you start buying more and spending more just because of the savings, then you’re not doing yourself a favor," Beckmann says. |
According to the passage, some states choose to provide tax breaks because they want to ______ .
A．cast aside these promotions
B．pinch state budget books
C．slow down local economy
D．encourage their economies
真丝针织领带
