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On the bottom of most plastic packaging（包装）, there’s a small triangle （三角）with a letter or a number written inside. These little symbols are not easy to be noticed, but are really important. They tell you what kind of plastic it is and whether it can be recycled or not.
Can it be recycled? | Types of Plastic |
√ |   Pet This is the plastic that you often see on supermarket shelves! It’s used to make plastic water bottles and biscuit boxes. |
√ |   HDPE HDPE is a stronger type of plastic. It is what milk bottles are made of. |
× |   LDPE LDPE is a very soft plastic which is not easily broken. It is what shopping bags are made of. |
× |   PS (POLYSTYRENE] This plastic is often seen in our daily life. You’ll probably have seen it as those cheap white cups you get hot drinks in, or as takeaway food packaging. |
1．Which is a stronger type of plastic?
| A．PET | B．HDPE | C．LDPE | D．PS |
| A．Milk bottles. | B．Hot drink white cups. |
| C．Drinking water bottles. | D．Takeaway food packaging. |
| A．To introduce types of plastic. | B．To display reusable items. |
| C．To explain recycling methods. | D．To recommend shopping bags. |
同类型试题
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
