题目

下列化学反应中属于氧化反应但不属于化合反应的是（反应条件已省略）A．铝+氧气→氧化铝B．甲烷+氧气→二氧化碳+水C．氢气+氧气→水D．红磷+氧气→五氧化二磷 答案：【答案】B【解析】试题分析：氧化反应物质与氧气发生的反应属于氧化反应，化合反应为多种物质生成一种物质的反应，符合题意的反应为有氧气参加且不生成一种物质，故符合题意的为BA study involving 8,500 teenagers from all social backgrounds found that most of them are ignorant when it comes to money. The findings, the first in a series of reports from NatWesl that has started a five-year research project into teenagers and money, are particularly worrying as this generation of young people is likely to be burdened with greater debts than any before. University tuition fees (学费) are currently capped at ??3,000 annually, but this will be reviewed next year and the Government is under enormous pressure to raise the ceiling. In the research, the teenagers were presented with die terms of four different loans but 76 per cent failed to identify the cheapest. The young people also predicted that they would be earning on average ?? 31.000 by the age of 25, although the average salary for those aged 22 to 29 is just ?? 17,815. The teenagers expected to be in debt when they finished university or training, although half said that they assumed the debts would be less than ?? 10.000. Average debts for graduates are ?? 12，363. Stephen Moir, head of community investment at the Royal Bank of Scotland Group which owns NatWest, said. "The more exposed young people are to financial issues, and the younger they become aware of them, the more likely they are to become responsible, forward-planning adults who manage their finances confidently and effectively." Ministers are deeply concerned about the financial pressures on teenagers and young people because of student loans and rising housing costs. They have just introduced new lessons in how to manage debts. Nikki Fairweather aged 15 from St Helens, said that she had benefited from lessons on personal finance, but admitted that she still had a lot to learn about money. Which of the following can be found from the five-year research project? A. Students understand personal finances differently.  B. University tuition fees in England have been rising. C. Teenagers tend to overestimate their future earnings. D. The students' payback ability has become a major issue. The phrase "to raise the ceiling" in paragraph 2 probably means "______". A. to raise the student loans                       B. to improve the school facilities C. to increase the upper limit of the tuition     D. to lift the school building roofs According to Stephen Moir, students_______. A. are too young to be exposed to financial issues B. should learn to manage their finances well C. should maintain a positive attitude when facing loans D. benefit a lot from lessons on personal finance What can we learn from the passage? A. Many British teenagers do not know money matters well B. Teenagers in Britain are heavily burdened with debts. C. Financial planning is a required course at college. D. Young people should become responsible adults.