叶酸在体内叶酸还原酶的催化下转变为活性型的 ，是体内 酶的辅酶，携带 参与多种物质的合成。
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叶酸和维生素Bl2缺乏与巨幼红细胞性贫血的关系如何?
Unit 6-2-1Which of the statement is NOT true about business plans?
A. They are very crucial to success.
B. They guarantee success of business.
C. They may be tedious and time-consuming.
D. They help business owners plan ahead.
Unit 6-2-2The main function of a business plan is ______________.
A. to help business owners make better decisions
B. to help business owners make more money
C. to attract more investors to invest money
D. to attract more customers to buy the product
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