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【单选题】
在数列{}a n 中，如果存在常数T（T∈N * ），使得a n+T =a n 对于任意正整数n均成立，那么就称数列{a n }为周期数列，其中T叫做数列{a n ]的周期．已知数列{b n }满足b n+2 =|b n+1 -b n |，若b 1 =1，b 2 =a，（a≤1，a≠0）当数列{b n }的周期为3时，则数列{b n }的前2010项的和S 2010 等于（ ）A.
669
B.
670
C.
1339
D.
1340
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举一反三
【简答题】四环素类抗生素不稳定性的表现在哪些方面?
【单选题】According to the passage, which of the following statements is NOT true?
A.
Nobody knows for sure whether oil prices will go up or down in the future.
B.
China's increasing demand led OPEC to miscalculate production capacity.
C.
There has been little gains in average fuel mileage efficiency.
D.
The world will depend more on the Persian Gulf in the future.
【单选题】---Nobody knows which team will win the 2022 World Cup in Qatar . ----Yes. That's the ______ of the beautiful game.
A.
question
B.
luck
C.
hope
D.
magic
【单选题】Nobody knows what triggered the event, which______ a million cubic meters of water per second, obliterating the barrier between Britain and France.
A.
released
B.
relieved
C.
restored
D.
retained
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