题目

If your boss asks you to work in Moscow this year, he’d better offer you more money to do so — or even double that depending on where you live now. That’s because Moscow has just been found to be the world’s most expensive city for the second year in a row by Mercer Human Resources Consulting. Using the cost of living in New York as a base, Mercer determined Moscow is 34.4 percent more expensive including the cost of housing, transportation, food, clothing, household goods and entertainment (娱乐). A two-bedroom flat in Moscow now costs $4,000 a month; a CD $24.83, and an inte据报道，月球的土壤中吸附着数百万吨的32He，在地球上，氦元素主要以 42He的形式存在．下列说法正确的是（　　） A、 32He 和 42He 互为同素异形体B、 42He 原子核内含有4个质子C、 32He 和 42He 互为同位素D、 42He原子核内含有3个中子