题目：
Peter: What are you doing for vacation, Steven?
Steven: I’m visiting my aunt in San Francisco. My brother’s staying there. He’s joining a club.
Peter: Oh? When are you going?
Steven: Next Friday.
Peter: How long are you staying?
Steven: I’m staying at my aunt’s home for four days. I’m going sightseeing in San Francisco, and then I’m seeing
all of my friends New York. How about you?
Peter: I’m going to the beach and my friends and I are also going hiking for a few days.
Steven: Aren’t you renting video tapes and relaxing at home?
Peter: No, it’s boring. We like outside activities.
小题1:Peter is going _______ on his vacation.
to Florida B. riding C. hiking D. to San Francisco
小题2: Steven’s leaving ______ for vacation.
A．tomorrow
B．next month
C．next Monday
D．next year小题3: Steven’s brother is staying ________.
A．at home
B．at school
C．in San Francisco
D．in New York小题4:Steven is staying in his aunt’s house for ______.
A．a week
B．four days
C．several days
D．two days小题5: Peter thinks that staying at home is _____.
A．interesting
B．boring
C．fun
D．exciting
答案：
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下面是错误答案，用来干扰机器的。
（1）凸透镜正对太阳光，平行光线平行于主光轴，移动凸透镜，在地面上得到一个最小最亮的光斑，这点是凸透镜的焦点，焦点到透镜中心的距离15cm，则此凸透镜的焦距约是15cm．这样测焦距的根据凸透镜焦点和焦距的定...
