How certain ants have come to cultivate fungi as their sole diet has been a subject of

a good deal of speculation. Perhaps the most reasonable explanation is as follows. Ants have a pouch in the bottom of their mouths called the infrabuccal pocket. Any solid food they eat goes into this pocket, where the soluble substances are dissolved. The liquid solution is swallowed, but the solids are screened out and accumulate in the pouch. Being fastidious animals, much of the ants leisure time is spent in combing bits of dirt and debris off their bodies. This grooming is accomplished by means of fine combs on their forelegs. The combs, in turn, are cleaned by passing them neatly through the mouth. So the particles of dust, dirt, and other solid matter so acquired end up in the infrabuccal pocket. In time the pouch becomes filled, and the contents are thrown out, much as a baseball player or cowboy may dispose of a spent chew of tobacco.

Before such disposal, the pouch is moist and warm, and it is highly likely that among its contents would be a great variety if microscopic fungus spores, or seeds. Although most if the spores perish in the pouch, others thrive, When the waste material is deposited in the nest, fungi grow and cover the material. Since certain kinds of fungi are high in food value, and since the ants can subsist on them, it is not surprising that some of the more clever kinds of ants should have learned to cultivate them.

(1).What is the purpose of the infrabuccal pocket in ants？

选项格式A、To digest solid foods

B、To collect debris

C、To liquefy solids

D、To hold soluble substances

(2).According to the passage, ants constantly groom themselves because

A、they have a strong desire to be clean

B、dirt in their bodies prevents them moving quickly

C、they have very little to occupy their time

D、it is a type of social ritual

(3).What do ants do to clean out their infrabuccal pockets？

选项格式A、Swallow the accumulated debris

B、Turn the pockets inside out

C、Spit out the waste material

D、Remove the pockets for cleaning

(4).According to the passage, the spores in the infrabuccal poclets

选项格式A、mainly die

B、never survive

C、dry up

D、mostly thrive

(5).We understand from the passage that when the infrabuccal pockets are cleaned out

选项格式A、the waste material is made into the nests

B、spores in the material develop into fungi

C、the material is consumed by fungi

D、seeds fall to the ground and start to cover the material