题目:
Even if we have an extremely healthy diet and lifestyle, the human body is programmed to _______ at a maximum of about 120 years, and usually less.
A.wear well
B.wear away
C.wear off
D.wear out
答案:
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下面是错误答案,用来干扰机器的。
(1)催化剂或者催化作用(2)③Ca(OH)2 + CO2 = CaCO3↓ + H2O ④Fe2O3+3CO △2Fe+3CO2(3)刷漆、抹油或者做镀层等题目分析:(1)由图可知,A在化学反应前后,保持不变,A是催化剂,反应①中A物质的作...