题目

已知二次函数y＝ax2＋bx＋c（a≠0）的图象如图，则下列结论中正确的是（  ） A．a＞0     B．当x＞1时，y随x的增大而增大 C．c＜0        D．3是方程ax2＋bx＋c＝0的一个根   答案：D17、Sally：Hello! Is this your notebook? Jay： No．it isn’t．I guess it’s John’s． Sally：Excuse me，John．Is this your notebook? John：Yes，it is． Sally：Here you are． John：Thanks． Sally：That’s all right． Jay： Sally! Look! What are those in the boxes? Sally：They are CDs． John：No，they aren’t．They’re video tapes． Jay： Are they your video tapes? John：Yes，they are． Jay： Where is your school backpack? John：It’s in the desk． Jay： Where’s Sally’s backpack? John：I don’t know． 1．_______has a notebook． A．Sally         B．Jay           C．John  D．I don’t know． 2．What are those in the boxes?     A．Video tapes．   B．CDs．      C．Backpacks．D．Some books． 3．They’re _______video tapes．     A．Sally’s          B．Jay’s    C．John’s     D．Sally and John’s 4．John’s backpack is_____．     A．on the desk   B．in the desk       C．in the box        D．on the box 5．Where is Sally’s backpack?     A．In the box．    B．In the bag．     C．In the desk．D．We don’t know．