二．单项选择（把正确的选择项填到题前的括号内，每题2分,共30分。）
（ ）1.-- Good morning.
--________.
A. Hello B. Good morning C .Good afternoon D. OK
( ) 2.-- How are you ?
-- ______________.
A. Thank you B. Sit down, please. C. I’m fine D. Good morning
( ) 3. What this ?
A. am B. are C. is D. be
