1) Is it made of cotton?

是棉布的吗?
2) This kind of cloth is produced from cotton.

这种布是棉的。
3) The throw is made of cotton.

这床罩是棉布做的
5) It is conceivable that..

难道是…的吗?
6) D: Is the mucus sticky?

是粘稠的吗?
参考词条