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【简答题】
已知等差数列{a n }的首项a 1 及公差d都是整数，前n项和为S n （n∈N * ）．若a 1 ＞1，a 4 ＞3，S 3 ≤9，则通项公式a n =______．
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反馈参考答案：
举一反三
【单选题】There are some things for children. Let's . [ ]
A.
give away them
B.
gave away them
C.
give them away
D.
gave them away
【简答题】We would be very ______ (delight) if you could give us an early reply.
【多选题】旅游产业在性质上,突出表现为( ) In the nature of tourism industry, it is highlighted( 突出表现 ) as ( )
A.
全域性 comprehensiveness
B.
配置性 configuration
C.
服务性 service
D.
协调性 coordination or harmony
【单选题】他答应给我回复的,但却没有。(give sb. a reply)
A.
He promises to give me reply, but he didn’t.
B.
He promised to give me a reply, but he didn’t.
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