改革开放新的历史起点上，我国政治体制改革的主要任务是什么？
查看答案
The reader learns that toxic chemicals get into our food________.
A. when plastic becomes small enough to enter our food chain
B. because other animals are being killed by plastic
C. because plastic does not biodegrade
D. from plastic bags from supermarkets
According to the passage，which animals appear most often on the cave wails？
A. Birds.
Bison.
C. Horses.
D. Wild cats.
How does the writer feel about sounds in general？ 查看材料
A. They make him feel at home.
B. He thinks they should be ignored.
C. He believes they are part of our lives.
D. He prefers silence to loud noises.
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