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【单选题】
动态规划的理论依据是：A.
最优性原理
B.
多阶段决策
C.
线性规划
D.
库存原理
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】He doesn't (say) in his letter (that) he's going to (be back) (or not).
A.
them
B.
that
C.
be back
D.
or not
【单选题】He doesn't (say) in his letter (that) he's going to (be back) (or not).
A.
say
B.
that
C.
be back
D.
or not
【简答题】A．Put a stamp on the letter. B．Make his letter shorter. C．Keep working on the letter. D．Send the letter as it is.
【单选题】Last summer the author got a letter from a man asking to cancel his wife's subscription.
A.
Y
B.
N
C.
NG
【简答题】属于养生方法的是 应试点拨：养生方法相对养生原则更为具体。 查看材料
【单选题】--Why did he cry yesterday?--He was excited, for he ______ his mother’s letter.
A.
expected
B.
was expecting
C.
had expected
D.
had been expecting
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