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17£®ÌýµÚÊ®¶Î¶À°×£¬»Ø´ðµÚ17ÖÁµÚ20ËĸöСÌ⣮17£®What was the weather like in the north of China the day before yesterday£¿
A£®Snowy£®B£®Rainy£®C£®Smoggy£®
18£®What was yesterday's weather warning level£¿
A£®Red£®B£®Yellow£®C£®Orange£®
19£®Which of the following is true according to the passage£¿
A£®Snow and rain have already brought an end to the heavy smog£®
B£®Beijing's PM 2.5 levels became worse in 2015£®
C£®Recently Beijing has gone through two red alerts for smog£®
20£®What is the passage mainly talking about£¿
A£®The weather condition in Beijing£®
B£®The pollution situation in northern China£®
C£®The weather forecast in northern China£®
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