题目内容：
根据下列材料，请回答题：
From the passage we know the quality of the products
[ A ] is as high as before
[ B ] is lower
[ C ]is improved
[ D ]is reduced
参考答案：
答案解析：
单选题：根据下列材料，请回答题： From the passage we know the quality of the pro
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From the passage we know the quality of the products
[ A ] is as high as before
[ B ] is lower
[ C ]is improved
[ D ]is reduced