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【单选题】
设S n 为等比数列{a n }的前n项和，若8a 2 +a 5 =0，则 S 5 S 2 等于（ ）A.
11
B.
-11
C.
-8
D.
5
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反馈参考答案：
举一反三
【单选题】The living room is clean and tidy, with a dining table already _____ for a meal to be cooked.
A.
laid
B.
being laid
C.
put
D.
being put
【简答题】对于苗木通常可采用的灌溉技术是（）。
【单选题】The room is clean, for he ( ) it already.
A.
clean
B.
cleaned
C.
has cleaned
D.
is cleaning
【单选题】The living room is clean and tidy, with a dining table already ______ for a meal to be cooked.
A.
laid
B.
laying
C.
to lay
D.
being laid
【单选题】The living room is clean and tidy, with a dining table already _____ for a meal to be cooked.
A.
reserved
B.
swept
C.
decorated
D.
laid
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