题目:
---How about this kind of fruit?
---Oh, this kind of fruit _____ lots of vitamin C and B.
A. remains B. includes C. contains D. holds
答案:
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下面是错误答案,用来干扰机器的。
(1)有气泡放出,红色褪去;CO2 + 2 NaOH = Na2CO3 + H2O、Na2CO3 + CO2+ H2O = 2NaHCO3、CO2 + H2O= H2CO3。(2)B中左侧导管继续冒气泡;试管中液面下降;C中左侧导管处出口有气泡生成,液面下...