——How many ________ are there on the table?
——Three. Are you thirsty? Let's cut one and eat it.
A：onions
B：ducks
C：watermelons
D：sandwiches
—Water had got into it，and it was completely .
下列生活用品中，所使用的主要材料属于有机合成材料的是____ ．
A．塑料脸盆 B．纯棉毛巾 C．玻璃茶杯
