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Câu hỏi:
According to the passage, the numerical value of the concentration level of a substance is only useful if _____?
- A. it is in a localized area
- B. the other substances in the area are known
- C. it can be calculated quickly
- D. the natural level is also known
Lời giải tham khảo:
Đáp án đúng: D
Giải thích:
Theo đoạn văn, giá trị số của mức nồng độ của một chất chỉ hữu ích nếu _____?
A. nó nằm trong một khu vực cục bộ
B. biết được các chất khác trong khu vực
C. nó có thể được tính toán một cách nhanh chóng
D. biết được mức độ tự nhiên
Thông tin:
“in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area" (trên thực tế, chỉ số chỉ có ý nghĩa khi chúng ta nhận ra sự gia tăng này lớn hơn bao nhiên nồng độ trong tự nhiên)
→ Chọn đáp án D
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