简述生产集中与资本集中？
参考答案：
生产集中即生产资料、劳动力和商品的生产集中于少数大企业，资本集中即大资本吞并小资本，或由小资本合并成大资本。
—All of us had a good time in the picnic last Sunday. Pity you weren't there.
—I really ________ come but I was looking after my mother in hospital. [ ]
A. must
B. ought to
C. need have
D. should have
按照立党为公、执政为民的本质要求，凡是涉及群众的切身利益和实际困难的事情，再小也要竭尽全力去办。这是因为（）。
A.群众利益无小事
B.根本利益表现为群众切身利益
C.越有困难越涉及群众利益
D.各种具体利益构成根本利益
