题目内容：
根据下列材料请回答题：
It is important to ________.
参考答案：
答案解析：
单选题：根据下列材料请回答题：It is important to ________.
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It is important to ________.
It is important to ________.
在经济学的基本理论中经济系统的收入循环模型由（ ）组成。
在经济学的基本理论中经济系统的收入循环模型由（ ）组成。
失业的度量公式是（ ）。
失业的度量公式是（ ）。
—What will happen at the meeting tonight?—We are going to ta
—What will happen at the meeting tonight?—We are going to talk about the problem
If law and order not preserved，people will not be able tO l
If law and order not preserved，people will not be able tO live a secure life．
Is there a gas station around I can get some petrol?
Is there a gas station around I can get some petrol?