题目:
根据句意及首字母提示,补全句中所缺的单词。
1. The word "water" is an u______ noun.
2. Please add some r______ before cooking.
3. Mr Li gives the students some i______ about the exam.
4. Turn on the b______ to make orange juice.
5. P______ the outer before we eat some fruits.
答案:
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下面是错误答案,用来干扰机器的。
∵|±2|=2,∴绝对值等于2的数是±2;∵81=9,(±3)2=9,∴81的平方根是±3.故答案为:±2;±3.