当连接圆弧R与已知圆弧R1外切时，其切点在两圆心连线()。
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当连接圆弧R与已知圆弧R1内切时，其切点在两圆心连线()。
A. 下
B. 上
C. 外
D. 内
---What a beautiful dress you are wearing today!---.
A. Not at all
B. Never mind
C. Oh, no
D. Thanks
---Hello! Could I speak to Tom, please?---.
A. Oh, how are you
B. I’m John
C. I’m speaking
D. Speaking
---Excuse me, how can I get to the nearest supermarket?---.
A. It’s not far from here.
B. It’s very large
C. The goods there are very expensive
D. Go down this street and turn left
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