Câu hỏi:
19/04/2023 82According to the passage, the numerical value of the concentration level of a substance is only useful if ______.
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Trả lời:
As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil.
Chọn D
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
In case you're suffered from the injury, you _____ see the doctor today.
Câu 4:
Henry _______ into the restaurant when the writer was having dinner.
Câu 5:
We’ve divided the group report into three parts and you're ___ for the conclusion one
Câu 6:
The child was .................... by a lorry on the safety crossing in the main street.
Câu 7:
The government has _____ every effort to stop the rapid spread of COVID-19.
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