A.-1
B.0
C.1
D.2
第3题
第5题
A: No, there isn't
B: Yes, it is
C: On the ground floor
D: It is empty
第6题
(1) The perimeter of the floor is a whole-number multiple of 10.
(2) The diagonal of the floor measures [*].
第7题
A.White S
B.Orange S
C.Red S
D.Brown S
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