单项选择
31.. —Why does Mark work so hard?—Because he has a big family to ________.
A. choose B. support C. miss
32. —How long has your uncle been abroad?
—He has been abroad ________ I was born.
A. unless B. after C. since
33.I _____ have short hair, but now I ______ having long hair.
A. use to, am used to B. used to, am used to C. am used to, used to
34. — is the population of China?
--It is about 1.3 billion.
A.How many B.How much C.What
