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问题
选择题
若2y-7x=0，则x：y等于[ ]
A. 7：2
B. 4：7
C. 2：7
D. 7：4
答案
答案：
C
补全对话，情景问答
选择合适的短语连线。
1. What's your favourite toy?
2. How old are you?
3. Are they fat?
4. What's this?
5. What are they?
A. It's an elephant.
B. Yes, they are.
C. It's a doll.
D. They are tigers.
E. I'm ten.
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填空题
网络接点之间的接口用（）表示。
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