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We have found plastic in the ocean and in animals like birds, fish and whales. But for the first time, scientists have found plastic in human poop (大便) , USA Today reported. The findings came from a study led by scientists from Environment Agency Austria
In fact, plastic is everywhere around us. Every year, lots of plastic waste goes into the ocean.
Some past studies may also give us a clue.
根据短文内容从方框中选出五个句子填入文中空缺处使短文内容通顺完整。
| A. There, sunlight and waves (海浪) break the plastic waste down to very small pieces. B. The scientists are sure that the plastic must be harmful to humans. C. According to USA Today, 90% of sea salt which is sold in the world includes plastic. D. The scientists followed eight healthy volunteers from different parts of the world. E. However, the scientists aren't sure if the plastic is harmful to humans. F. Scientists found nine different kinds of plastic in the stool samples, according to the study. |
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y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
