costing 测验

This includes an infrared spectroscope that has been used to figure out the chemical fingerprints of things as varied as asteroids and illegal drugs; a device called a microfadeometer, which trains an intense beam of light — 8 million lumens per square meter, compared with about 120,000 for a cloudless day with the sun at high noon — on a tiny area of a painting to see how it fades; a hulking Atlas Ci4000 Xenon Weather-Ometer, which simulates the effects of decades of sunlight and heat in just months; and a scanning electron microscope _______ more than a million dollars.

For $6.99 a month, the other would enable listeners to choose 50 of the nonpremium channels, with each additional channel _______ 25 cents.