A:春秋和战国
B:秦和春秋
C:战国和三国
D:秦初和汉初
一Do you think that a person can really lose weight by eating fruit?
一No, I don't think so.
注射器的针头做得很尖,其目的是为了增大____;注射器能将药液吸入针筒是利用了____的作用.
—I've got a headache.
—No wonder.You in front of the computer too long.