新兴的大脑营养学研究发现，大脑的生长发育与不饱和脂肪酸有密切的关系，从深海鱼油中提取的，被称为“脑黄金”的DHA就是一种不饱和程度很高的脂肪酸，它的分子中含6个碳碳双键，化学名称为二十二碳六烯酸，则它的分子组成应为
| A．C22H39COOH | B．C21H42COOH | C．C22H33COOH | D．C21H31COOH |
相关试题
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
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 |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
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