Silver is the best conductor of electricity, copper _______ it closely．
A． followed B． following C． to follow D． follows
黎明文化寒假作业系列答案
寒假天地重庆出版社系列答案科目：高中英语 来源：必修五设计英语北师版 北师大版 题型：016
Mr Silver is a person we can fully depend on．I don’t question ________ this is a true story．
whether
why
that
how
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科目：高中英语 来源：2014届安徽省高三上学期期中考试英语试卷（解析版） 题型：阅读理解
Gray hair is simply a part of the normal aging process, and the rate you go silver is genetically predetermined. Going gray is not associated with earlier death, and premature graying is not, generally speaking, a sign of an illness or ill health in younger adults. There are, however, some specific health conditions associated with gray or white hair, but for most of us, going gray is just a fact of life.
Hair color comes from the pigment melanin(黑色素), which determines your individual shade. Hair without any melanin is pure white. The pigment is produced in cells called melanocytes, which inject pigment into the hair. At some point in everyone's lifetime, these cells slow down and eventually stop producing color. Scientists have yet to identify the exact mechanism by which melanocyte cell death occurs.
A study of more than 4,000 women and men from 20 countries determined that about 75% of people between the ages of 45 and 65 have some gray hair. In general, people of European descent gray earliest followed by Asians and Africans. It's interesting to note that a lucky 1 in 10 has no gray hair by retirement age. Beginning at age 30, your chances of having gray hair go up 10-20% per decade.
It may feel like you have more grays after a stressful event, but that's probably because middle age is basically a series of anxiety-ridden events. Between working, raising kids, and caring for older parents, the "sandwich" years of 45-65 can be stressful, especially for women. They are also when we naturally start to look older.
At this point, there is still no silver bullet to keep away the grays.
1.What would be the best title for this passage?
A. Going gray. B. Tips to make hair color last
C. Why does hair turn gray? D. Gray hair is in fashion.
2.Which of the following is a true statement according to the passage?
A. Scientists have found out how to prevent hair from turning gray.
B. Europeans are more likely to gray than Asians and Africans.
C. Gray hair means poor health or a sign of illness.
D. Everyone will inevitably get gray hair by retirement age.
3.Which is not among the reasons for hair turning gray according to the passage?
A. Being physically weak. B. Stress from different sides.
C. Death of melanocyte cell. D. Genetic factors.
4.What does “silver bullet” in the last paragraph probably mean?
A. Make-up B. Scientific research. C. Chemical weapon. D. Cure.
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科目：高中英语 来源： 题型：
____ that silver is not widely used as a conductor?
A. Why is B. Is it why C. Why is it D. Why is that
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科目：高中英语 来源：2010届三轮回扣语法专项训练（特殊句式3） 题型：单选题
____ that silver is not widely used as a conductor?
| A．Why is | B．Is it why | C．Why is it | D．Why is that |
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