1 . To produce the classic clothing, blue jeans, producers rely on indigo dye (靛蓝染料), the only molecule known to provide jeans’ unique, beloved color. While indigo itself naturally comes from a plant, growing demand for blue jeans throughout the 20th century gave rise to synthetic (合成的) indigo, which is now more commonly used.

Indigo is the dye that makes jeans blue, but it doesn’t mix with water. To dye clothes, usually, chemicals are needed to make the color stick to the cloth. But in Denmark, scientists have created a new way to dye clothes using an enzyme (酶), which is a kind of protein that can cause chemical reactions, instead of harmful chemicals. This new method is better for the environment and doesn’t use poisonous stuff.

The chemical process for dyeing blue jeans has persisted for the last century. Workers are exposed to the poisonous chemicals, which also pollute the environment near factories. Waste water from those factories often ends up in waterways, decimating local ecosystems and even dyeing rivers blue.

Ditte Hededam Welner, the study’s lead researcher, says their new enzyme works really well and is strong enough for making lots of jeans without breaking down. This enzyme makes dyeing with indican, which is like indigo, much less harmful to the planet — about 92% better than the old way.

However, the new method doesn’t fix all the environmental problems of making jeans. Making a single pair of jeans uses a lot of water — enough to fill many bathtubs — from growing the cotton to putting the final touches on the jeans.

Even though the new dyeing process is better for the environment, it’s not always easy or cheap to change to it. Welner’s team isn’t sure if jeans companies will find it easy or affordable to switch to this method. It costs a little bit more — just seven cents extra per pair of jeans — to use the enzyme for dyeing. But Welner believes it’s worth it because it’s much better for the environment.

1. Why was synthetic indigo created in the 20th century?

A．It made jeans’ color unique.	B．It was easy to dye cloth with it.
C．People liked jeans made from it.	D．People were in greater need of jeans.

2. What does the underlined word “decimating” in paragraph 3 mean?

A．Troubling.

B．Entering.

C．Destroying.

D．Defeating.

3. Which is an advantage of the new method?

A．The colour is more beautiful than the synthetic indigo.

B．The market can keep stable goods supplies.

C．Enzyme facilitates the advance of science.

D．The dye is more environmentally friendly.

4. What makes Welner worried about the new method?

A．Production costs.	B．Environmental benefits.
C．Water consumption.	D．Laborer shortage.

2 . Most of us have heard of the 3Rs: reduce, reuse and recycle. It is the core principle of a sustainable (可持续的) life, but few of us can apply it in our own lives. Now, there’s a “lab” you can explore and discover a way toward living sustainably.

3R Lab is located in Xuhui district, Shanghai. It offers exhibitions, activities and goods that showcase the 3R principle. The key to a sustainable life, according to Vincent T. M. Fong, the 32-year-old from Hong Kong who created the lab, is to make it a long-term promise. “A sustainable life should be sustainable itself in the first place. You can’t lead a sustainable life on a whim. Small and comfortable changes are exactly what you need,” Fong said.

The lab regularly hosts ugly fruit markets, offering these strange fruits which are often thrown away by traditional markets and consumers at a quite attractive price. “They’re thrown away simply because of their appearance. Buying fruit regardless of how they look reduces food waste significantly in our daily life,” Fong commented.

A water tank with two types of straws is another equipment in the lab. “One type is made from normal plastics widely used in our daily life while the other is from PHA, a new replacement for plastics, and the water is sourced from the Suzhou River,” explained Ni Li, an employee of the lab. Visitors can see how the PHA straws degrade (降解) into a thin layer in just one month, while the others remain unchanged.

“Leading a sustainable life does not necessarily mean sacrifice,” said Fong. Consuming ugly fruit and using degradable plastics are small changes that are good for the environment and easy to stick to. Only in this way can the 3R principle become part of our lives, he added.

After working there for six months, Ni, who wasn’t mindful of the 3R principle before arriving at the lab, now uses her cup every time she buys a coffee. “The job has reshaped my life,” Ni said.

1. What does the-underlined phrase “on a whim” in the second paragraph probably mean?

A．In a rush.	B．On a regular basis.
C．Without any reason.	D．As a common practice.

2. What is the purpose of the ugly fruit market at 3R Lab?

A．To reduce food waste.	B．To promote healthy eating.
C．To sell new kinds of fruit.	D．To provide more affordable fruit,

3. What can the water tank at 3R Lab show to its visitors?

A．The water pollution caused by plastics.	B．The degradation of PHA straws.
C．The interaction between two types of straws.	D．The disappearance of normal plastic straws.

4. What can we infer from the last paragraph about Ni?

A．She avoids going to traditional markets.	B．She has devoted less time to her hobbies.
C．She has got rid of a few bad habits.	D．She is leading a low carbon life now.