When you are in a foreign country, you may miss ______ Chinese food a lot. As a result, you hope to have ______ big supper after a tiring day.

A．/; a

B．a; a

C．/; /

D．a; /

皮肤中的血管有收缩、舒张作用，汗腺有分泌汗液的作用，主要通过它们调节体温。