单项选择题

A. He is worrying that they have run the red light
B. He is worrying they have to spend more money on a good budget.
C. He is worrying that they cannot afford the construction.
D. He is worrying he is not good at making budget.
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单项选择题
Why does the author include rayon in, though it is not a plastic
A. Because it is a significant manmade semi-synthetic discovered in the ocean.
B. Because it is a major natural semi-synthetic appearing in the marine.
C. Because it is a minor manmade synthetic dug out in the marine.
D. Because it is a significant natural synthetic explored in the marine.
填空题
human-operated
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