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Black-and-white images are not usually stark contrasts of black and white. They combine black and white in a continuum, producing a range of shades of gray.
Bloomberg Intelligence estimates that China's new infrastructure construction will require 150,000 metric tons of copper, or equivalent to 1.2 percent of the country's total copper demand.
Bolivia relies heavily on the mining and sales of natural gas, but a sharp decline in those exports to its main buyers in the region and the plunge in international prices of oil and gas have created challenges.
Boko Haram, which has more than two factions in Nigeria, is yet to claim responsibility for the attack.
Boeing said it hopes to have MAX jets back in the air by the fourth quarter of the year, but the FAA has long stressed that there is no timetable for recertification.
来源：资阳报