1 . On Earth Day, people around the world work to help our planet. But April 22 isn't the only day this happens. Many people, including kids protect the Earth all year long. Read about some inspiring stories, then decide how you will make a difference.

Justin Sather, 10, from Los Angeles, California

When he was 5, Justin learned that his favorite animal’s habitat was in danger. So he hopped into action. He started a group called For the Love of Frogs and sold toy frogs to raise money. Justin said that frogs are an " indicator species" which means that when their habitat is threatened, they show signs of illness earlier than other animals. "Frogs are telling us our planet really needs your help, "Justin added.

Aadya Joshi, 16, from Mumbai, India

When Aadya was 13, she changed a junk lot in her neighborhood into a garden by using plants native to the area because native species attract native insects and animals. " The way to fix the habitat isn't just to plant any tree," she says. "It’s to replace what was torn down from that spot. " Now Aadya is leading the Right Green, an organization she founded to educate people about growing native plants and maintaining healthy ecosystems.

Xavier Baquero-Iglesias, 11, from Naples, Florida

While playing with friends on Astroturf (artificial grass), Xavier noticed it was super hot, much hotter than real grass. Xavier used his knowledge of science to figure out why. Then he invented SoleX Turf which uses the heat from Astroturf to make electricity. Xavier says his invention creates electricity in a way that’s less harmful to the environment, "I wanted to find a way to reduce the effects of climate change and the main way is to find renewable energy sources. "

1. What do the underlined words " indicator species " in paragraph 2 refer to?

A．Frogs living in damaged habitat.

B．Animals like frogs facing extinction.

C．Animals suffering from deadly illness.

D．Creatures monitoring environmental changes.

2. What is the proper way to repair the ecosystems according to Aadya?

A．Planting more trees.

B．Growing native plants.

C．Changing junk lots into gardens.

D．Preventing foreign insects and animals.

3. What is the value of Xavier’s invention?

A．It can make Astroturf cool.

B．It helps reduce electricity waste.

C．It can bring down the price of electricity.

D．It makes electricity in a pollution-free way.

4. Which of the following can be the best title for the text?

A．Activities on Earth Day

B．Kid Heroes for the Planet

C．Organizations for the Ecosystem

D．Benefits of Protecting the Farth

2 . Open an app at your smart phone and scan the code bar on the garbage can. When you throw garbage into the garbage can, it will show the weight of the garbage and the points you can get from doing so.     1     It will become more popular in the future. Yes, we are talking about the smart garbage can.

    2     The environmental problems have become constant headaches in the development of those cities. Encouraging garbage classification has become an effective way.

In some cities, a variety of multifunctional smart garbage cans are being put into use. In Beijing, for example, a smart garbage can is equipped with an LED screen, which not only shows national policies on garbage classification but also shows the correct steps for garbage sorting. It can also calculate the weight of the garbage and the accumulated points one can get. They can be traded for some articles of daily use.     3     Its body is actually a screen. It is equipped with some Internal sensors. When people throw garbage into it, the internal sensors can automatically tell the types of the garbage. Meanwhile, people can see how to deal with them.     4    

Garbage disposal is a small issue that involves everybody each day. However, it is also a big issue.    5     With smart garbage cans in our daily life, the idea of garbage sorting will become more established. Our dream of building a greener and more beautiful China will come true so long as we start to make small changes right now.

A．Garbage sorting has been a new fashion.

B．Another kind of garbage can is even smarter.

C．It is no wonder that residents cheered for their presence.

D．Such a way of handling garbage has appeared in some cities.

E．It will affect China’s transformation towards green development.

F．Over 200 million tons of garbage is produced each year in some cities.

G．The good habit of garbage classification can improve the living environment.