大学英语四级全真模拟冲刺试题一 附答案【2】

a stove and a forced air furnace are all convection heaters. A quartz heater on the other hand heats the objects and people in the room without heating the air. It does this by producing radiation heat that travels like light waves. When the quartz...

Guangdong Museum opens on Friday nights in summer vacation, with 5,000 tickets added From July 21st to August 25th, the Guangdong Museum will resume its opening on Friday n...

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