听下面一段材料,回答1-3题。 1.What does the man want? A. Less work. B. More fun. C. A holiday. 2. How does the man feel? A. Dissatisfied. B. Excited. C. Tired. 3.What is the man’s attitude towards his older generation? A. Hate. B. Dislike. C. Envy.
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【简答题】集合M={f(x)|存在实数t使得函数f(x)满足f(t+1)=f(t)+f(1)},则下列函数(a、b、c、k都是常数): ① y=kx+b(k≠0,b≠0);② y=ax 2 +bx+c(a≠0); ③ y=a x (0 (k≠0);⑤ y=sinx. 其中属于集合M的函数是________.(填序号)