Replacing some things in your house at the right time can make you healthier. Some researches show us when and why the following things should be replaced.

Word Box: wool羊毛 dry-clean 干洗  bacteria 细菌
【小题1】According to the form above, _________ of the four items is (are) mainly made of wood.

A．one

B．two

C．three

D．four

【小题2】Your _____ needs replacing every three months because it may cause you to have a toothache.

A．toothbrush

B．cutting board

C．chopsticks

D．blanket

【小题3】You should clean ___ with boiling water.

A．chopsticks and blankets	B．toothbrushes and cutting boards
C．cutting boards and chopsticks	D．cutting boards and blankets

【小题4】Which of the following is TRUE according to the form above?

A．Your cutting board should be dry-cleaned hot water.

B．Being worn out is the reason for replacing your blanket.

C．Warm water prevents your chopsticks from producing bacteria.

D．The material of toothbrush is the same as that of the chopsticks.