综合填空。(10分)
afford, few, uniform, study, kind, eat, except, show, enough, healthy
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Food and clothing are very important for us. We can’t leave them in our life.
As we know, food gives us energy. We must have
小题1:
food to keep us healthy. If we choose the right food, we can have healthy
小题2:
habits. We should eat more fruits and vegetables instead of biscuits, hamburgers, Beijing Roast Duck and so on. We should eat
小题3:
snacks and candies. Different food helps us in different ways. We should have different
小题4:
of food, such as fruits, vegetables, grain, eggs, milk, meat, fish and so on. Besides, we should exercise more often, so we can become much
小题5:
.
Different jobs require different clothes. We are middle school students. I think we should wear school
小题6:
at school every day, especially at school meetings, because suitable uniforms can not only
小题7:
good discipline but also make us happy. I think they can even make us
小题8:
much harder. Moreover school uniforms are cheaper than casual clothes. Clothes in fashion cost too much. We cannot
小题9:
them. So I think we should wear them at school
小题10:
on holidays.
，B=P-1AP，其中P为3阶可逆矩阵，则B2012-2A2=______.