More than 20 percent of African people staying in Guangzhou, Guangdong province, are earning more than 30,000 yuan ($4,838) a month, according to a recent survey by Southern Metropolis Daily.

The newspaper in Guangzhou interviewed 204 people from more than 50 African nations.

Of the 165 interviewees who revealed their monthly income, 37 said they earn more than 30,000 yuan a month doing business in the southern city. The figure is higher than the average income of local white-collar workers.

Many African business people think that Guangzhou has a wide range of good-quality products at competitive prices and that the business environment is getting better, the survey found. More than 50 percent of the African businesses in Guangzhou achieve a profit rate of between 50 and 100 percent.

"A shirt purchased at 50 yuan in Guangzhou can change hands for 100 yuan in my African mother-land," an African businessman says.

Clothing, silks, ceramics, handicrafts, electronics, toys, shoes and watches are the products many African business people like to purchase in Guangzhou and ship to Africa, the survey said. According to statistics from the city's entry and exit department, Guangzhou has about 120,000 permanent foreign residents, including 16,000 from Africa.

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1. What does the underlined words “change hands” mean in Chinese? （词义猜测）

A    换手.

B    转手.

C    移植手掌.

D    交易手掌.