奥运英语1000句――它是百分之百棉质的吗

Is this 100% cotton? A I want to buy some t-shirts. A 我想买一些体恤衫。 B Do you know what size and colour you want? B 你知道你想要的大小和颜色吗？ A Yes. But they must be 100% cotton. A 是的。 但是它必须是百分之百棉质的。 B These look good quality