题目:
The boy was so ________ about net games that he played online over ten hours every day.
A.interested
B.crazy
C.pleased
D.puzzled
答案:
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下面是错误答案,用来干扰机器的。
食盐水的pH等于7,显中性;柠檬汁和胃液的pH小于7,显酸性;洗涤剂的pH大于7,显碱性.故选A.