(B)21.Michael works for ________ animal hospital because he wants to learn about how to care for ________ animals.

A£®the£»an¡¡¡¡¡¡B£®an£»/¡¡¡¡¡¡¡¡C£®/£»the¡¡¡¡¡¡¡¡D£®a£»an

(D)22.Sorry£¬my grandma is ________ so she can't hear what you say.

A£®blind  B£®clever  C£®young  D£®deaf

(C)23.A high temperature is a ________ of fever.

A£®spirit  B£®notice  C£®sign  D£®letter