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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】——The birdwatching is very boring, isn’t it?——_____________ ．I only see few birds.——The birdwatching is very boring, isn’t it?——_____________ . I only see few birds.
A.
Yes, it isn’t
B.
Yes, it is.
C.
No, it is.
D.
No, it isn’t.
【单选题】— Why on earth didn't you answer the phone? — I'm terribly sorry, but the doorbell _____, too. [ ]
A.
is ringing
B.
rang
C.
was ringing
D.
has rung
【单选题】三棱柱ABC-A1B1C1中，M、N分别是BB1、AC的中点，设AB=a，AC=b，AA1=c，则NM等于（ ）
A.
a+12(c-b)
B.
12(a+b-c)
C.
12(a+c)
D.
12(a+b+c)
【单选题】We will celebrate the 90th birthday of the Chinese Communist Party ______ July 1st, 2011. [ ]
A.
on
B.
at
C.
in
D.
during
【单选题】—Does Tom __________ any soccer balls? —Yes, he __________ some. [ ]
A.
have, have
B.
has, has
C.
have, has
D.
has, have