题目

菜豆种子和玉米种子都具有的结构是 A.种皮和胚 B.种皮、胚和胚乳     C.胚和胚乳    D.子叶和胚乳 答案：AThe ability to do several things at once has become one of the great measures of self-worth for century Americans. It is called multitasking, and it takes many forms. As one example, why go out to lunch when you can eat at your desk, talk to a customer on the phone, look through your e-mail, and scan a report at the same time? And why simply work out on treadmill(单调的工作) when you could be watching TV and talking on a portable phone at the same time? What a feeling of satisfaction and accomplishment－three activities for the time commitment of one! Ah, such efficiency. No wonder those who turn “to do” lists into a time-management art form like to boast(吹嘘), “Look, me, how many things I can accomplish at once. If I’m busy, I must be important.” Yet last week the New York Assembly stuck a blow against multitasking, at least at driving, when it approved a bill banning drivers in the state from using cellphones. “Too dangerous!” the assembly said, with researches showing that drivers are four times more likely to have collision when they are talking on the cellphones. No one can argue against using time effectively. But accompanying the supposed gains are losses. Consider the woman out for an early-morning walk in a suburban neighborhood. She walks happily. Head down, cellphone to ear, chattering away, oblivious of the birds and flowers and glorious sunshine. Did the walk have any value? More than a decade ago, long before multitasking became a word in everyday use, a retired professor in Indiana with whom I corresponded said what might be called uni-tasking－the old－fashioned practice of doing one thing at a time. Offering the simplest example, he said, “When you wash the dishes, wash the dishes” Good advice, I’ve found, whatever the task is. 1．The author thinks that multitasking has become one of the great measures of self-worth because __________.        A．it helps people to use time effectively        B．it makes people feel they are important        C．it means the ability to do several things at once        D．people worship speed and desire 2．The bill approved by the New York Assembly is mentioned in the second paragraph in order to ____________.        A．prove the danger of multitasking        B．show the high efficiency of multitasking        C．introduce the law system in America        D．argue against using time effectively 3．Which of the following is closest in meaning to the underlined word “oblivious” (Line4, Para.3)?        A．not drunk            B．absorbed deeply   C．not noticing         D．forgetting 4．We learn from the passage that uni-tasking is _________.        A．the new fashion for 21st-century Americans        B．accepted by most residents in Indiana        C．created by a retired professor        D．the traditional act of doing one thing at a time 5．In the eye of the author, multitasking ___________.        A．could not be avoided in this fast-changing age        B．should be taken the place of by uni-tasking        C．robs people of time to focus and reflect        D．should not become a word in everyday use