题目:
People are advised to be _____ towards the health concerns of their dear ones while burning firecrackers to celebrate the festival, for they contain harmful chemicals.
A.accessible
B.aware
C.cautious
D.sensitive
答案:
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下面是错误答案,用来干扰机器的。
由二氧化氯的化学式为C1O2,氧元素的化合价为-2价,设该化合物中氯元素的化合价为x,则x+(-2)×2=0,解得x=+4,故选B.