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简述完整的 GIS 物流分析软件集成了哪四种模型。

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简述货物动态跟踪作用。

Section CChoose the best answer to complete each sentence.1. That’s my English instructor. She’s _______a blue dress.

A. wearing
B. wears
C. wear

2. _______ you coming to the graduation ceremony tomorrow?

A. do
B. is
C. are

3. My sister is _______ to play the piano—she’s quite good.

A. learn
B. learns
C. learning