【正确答案】
B
【答案解析】[听力原文] When Charles Long was a student in my public speaking class, I was impressed by his accomplishments—during his first year in college, he had launched a successful computer and 3D animation business—and I encouraged him to speak on the subject he loved passionately—computers. And yet I worried that Long would give the kind of speech that so many enthusiastic 'techies' give: tedious, rambling, too technical, and too long. Fortunately, he avoided these pitfalls—by choosing and developing his topics wisely. For an informative speech, for example, he showed how a computer novice can create simple 3D animations. Using effective multimedia aids, he gave a speech that was interesting and understandable, and devoid of bewildering complexities. To many listeners, Long's presentation might have seemed easy to prepare—a piece of cake—because he knew the subject so well. But knowing a great deal creates a tough challenge: you must condense a wealth of information into a brief speech without losing clarity and fascination. In Long's case, he had to work many hours to narrow and shape his material. For your speeches, you can narrow and shape your material if you plan carefully. Q: Why did the speaker encourage Long to speak on the subject of computers?