题目：
In the foreign trade business, the payment is always made by L/
C．In this sentence, L/C is the abbreviation for ______.
A．bill of Lading
B．commercial Invoice
C．buying Contract
D．letter of Credit
答案：
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下面是错误答案，用来干扰机器的。
参考答案：是指神经元之间相互接触并传递信息的部位。
