问题
选择题
下列几种情况中，通过改变物体受到的浮力大小使物体上升的是 [ ]
A．向盛有清水的杯子中加入食盐，沉在杯底的鸡蛋逐渐上浮
B．潜水艇从水底向水面升起
C．点燃孔明灯中的松脂后，灯就能够腾空而起
D．打捞沉船时向浮筒内压入高压气体
答案
答案：A
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下列几种情况中，通过改变物体受到的浮力大小使物体上升的是 [ ]
A．向盛有清水的杯子中加入食盐，沉在杯底的鸡蛋逐渐上浮
B．潜水艇从水底向水面升起
C．点燃孔明灯中的松脂后，灯就能够腾空而起
D．打捞沉船时向浮筒内压入高压气体
答案：A
| 补全对话 。 根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。 | |
| A: Hello, this is Susan Wilson. May I speak to Crower please? B: Hi, Susan. 1 A: Well,I'm calling about the theatre group I belong to. 2 And I thought you might be interested. B; Oh, gosh, you know how much I love acting, but I'm doing a hard job. I might be able to learn my part, 3 A: Well, actually, we practise only one night a week, Thursdays from seven to ten, though we would have to put in extra time before performances. B: 4 A: Sure, but look, why don't you come and watch next Thursday? I think you will like the way we work. 5 B: Okay, I'll come once, but I can't promise more than that. A: Great. I'll give you a call on Wednesday to remind you. Talk to you then, bye now. B: Bye, Susan.
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