A、 The first stomach compartment.
B、 The name of the upper jaw.
C、 The stomach where digestion takes place.
D、 The name of the bacteria in the cow's stomach.

【正确答案】 A

【答案解析】解析：信息明示题。短文中指出the paunch or rumen，the first of the four compartments in their stomachs。故可知rumen是牛四个胃中的第一个。所以选A。

A、 Food storage.
B、 The production of milk.
C、 Digestion.
D、 The creation of cuds.

【正确答案】 D

【答案解析】解析：信息明示题。短文中指出Later the food passes into the second stomach or reticulum where it is rolled into little balls or cuds．故可知第二个胃用来形成反刍的食物。故选D。

A、 Cud.
B、 Reticulum.
C、 Bacteria.
D、 Grass.

【正确答案】 C

【答案解析】解析：信息明示题。根据短文中Bacteria in cow’s stomachs aid in digesting the cellulose in stems of grass or hay．可知牛胃里的细菌帮助消化纤维素。故正确答案为C。