填入下面一段文字横线处的语句,最恰当的一句是( )太阳照耀大地,没有阳光人类不能存活。 。维生素D对调整人体内钙和磷的含量至关重要,并且可以预防佝偻病等疾病。如果没有直接供给,我们的身体就必须利用自身物质“制造” 维生素D这些物质可以从鲑鱼和鸡蛋等食物,或者从我们的皮肤中以胆固醇新陈代谢衍生物的方式得到。而在这些物质有效地转变成维生素D的过程中起至关重要作用的恰恰是紫外线B。
Did the reference give the information you needed—-Yes, but it, I had to read it entirely.
.—______ I lock the lab before I go home—Don’t bother.I’llcheck it myself later.
Must I give the dictionary back to the library nowNo,you_______.You can_______ it for another two weeks
Thanks for your help— Don’t mention it I _______ offered some advice