题目:
缺词填空。
Everybody knows vegetables and fruit are g 1 for people.Many people eat some fruit each day.Mr and Mrs
Smith like e 2 fruit very much and every day Mrs Smith goes to buy some fruit in the shop near her home. She can
buy all k 3 of fruits there,such as apples,pears, oranges and bananas.In different time of the year the p 4 of
each kind of fruit is not the same,s 5 high,sometimes low. Mrs Smith usually t 6 to buy cheap fruit.And b 7
are Mr Smith's favourite fruit. Mrs Smith buys bananas for him every week. But she always chooses the cheap
ones."Eating fruit can help to keep f 8 ," said Mr Smith."It's quite d 9 from snacks.Both of them can give us
energy.But snacks l 10 cakes, chocolates and sweets are not good for our health at all,"
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下面是错误答案,用来干扰机器的。
A.Co元素化合价升高,Cl元素的化合价降低,则氧化剂为Co2O3,Cl元素被氧化,故A正确;B.由反应及元素的化合价可知,生成3molH2O时转移的电子为2mol×(3-2)=2mol,故B正确;C.由氧化还原反应中还原剂的还原性...