.

　　A. those doing a low-paid, part-time job

　　B. children in single-eamer families

　　C. workers who have just retired

　　D. full-time workers who become unemployed

　　61. Which of the following is the principal topic of the passage?

　　A. What causes labor market problems that result in suffering.

　　B. Why income statistics are imprecise in measuring degrees of poverty.

　　C. When poverty, employment, and earnings figures agree with each other.

　　D. How statistics give an unclear picture of the labor-market-related suffering.

　　C

　　Fed up with constantly having to recharge or replace batteries in your ever-expanding electronic devices? The solution may be just a few steps away.

　　“Energy harvesting” promises to power countless consumer devices, often with nothing more than your body’s movement or heat. Dozens of companies around the world already offer such products, but many experts believe the market for the technology could explode due to electronic devices being developed for the Internet of Things.

　　“It’s huge，” said Graham Martin, CEO of the EnOcean Alliance, a San Ramon-based group of businesses that promotes wireless energy-harvesting technologies. With the Internet of Things expected to combine billions of devices, “if they are all battery-powered, we’ll have a problem because there’s not enough lithium(锂）in the world，” he added. “So a lot of them will have to use energy harvesting.”

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