由下列五种基团中的两个不同基团两两组合，形成的有机物能与NaOH反应的有（ ）
①—OH ②—CH3 ③—COOH ④—C6H5 ⑤—CHO
| A．2种 | B．3种 | C．4种 | D．5种 |
相关试题
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
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