题目

  例如：     It was very nice toget your invitation to spend ∧ weekend with you. the Luckily I  was  completelyfree then, so I’ll to say “yes”. I’ll arrive in Bristol at am around 8 p.m.  in  Fridayevening. on Good morning! Today, my topic is the valuable of time. Time, like the proverb says, is money. This means that if our time is good spent, it will turn out a lot of useful and important piece of work when the proper opportunity come. Although all time is precious, but the time of our youth is more precious than any period of our existence because this is the period w15．以下是小吴同学对所学知识的整理归纳，完全正确的是（　　）A、物质在微观上都是由粒子构成的，如：B、气体的性质决定了收集方法，如：C、物质的性质决定了它的用途，如：D、物质因组成结构差异，在性质上表现不同，如：A．AB．BC．CD．D