built the “Great Green Wall” to _____. A. help sand move to the south B. copy the United States’ example C. stop the earth and sand from moving away ……

't many trees, the ground can't keep enough water. Over the years, the grounddries upand turns to sand... parents to help you plant some trees this spring.If you see people cutting down too many trees, tell ……

【Listening Cafe】 BBAC听力原文：In 1620, about half of the US was made of forests. Today, the forests are almost all gone. A lot of good land has gone with them, leaving only sand. China doesn’t want ……

and improve the environment, bushes and trees are planted to create a protective barrier.To help trains....Wooden boards have been used to build sand barriers. Taller trees are planted on the outside ……

YO-O-H-O-H-H-H! Here we are, Xiangshawan (Resonant Sand Gorge), my long-cherished place! No trees, no streams, but undulating sand through and through. I stood dumbfounded by its vast expanse, like ……

and mouth with a mask that can keep out sand, or use a wet handkerchief.* Take cover... mainly tells us that _____. A. we should often give flowers to our mothers B. we should help those ……

and mouth with a mask that can keep out sand, or use a wet handkerchief.* Take cover... mainly tells us that _____. A. we should often give flowers to our mothers B. we should help those ……

of the sand is light and dry, it is easy for the wind to take it away. A wind will usually pile up (堆积....The wind may also take away all the sand and leave only rocks. When another wind comes from a different ……

the desert, your toes will help you to stay on top of the soft (柔软的) sand.”“OK,” said the son. A few...)?”“They are there to keep the sand out of your eyes in the desert.”After a short while, the son asked again: “Mom, why ……

to keep their jobs.US: Is Salmon your favorite food?Well, be prepared for more chicken dinners... war gather in Australia and wait for the black wind to carry the rest of the people away. When ……

. In 2022, people in the US bought 25-30 million trees! But where do the trees go after the holiday...”. Every year, people around the world buy lots of trees for Christmas. In 2022, people in the US ……

to keep the bugs away.Between 80 to 90 percent of trees are on this “wood-wide web” (木联网). Earlier...信号) through the networks. Other trees then pick up the messages and make special juice to keep the bugs away ……

(樱花) in Japan. People have parties under cherry trees, singing, dancing and chatting. It’s interesting that across the sea in the US, people also celebrate cherry blossoms in Washington, DC. The city ……

all the sand to one place.D. Built oases around cities.3. Planting new trees has helped China cut.... It was amazing to see new oases there. C. It was still full of sand. D. It was not easy to find any trees ……

from washing away. People also built dams (大坝) and reservoirs (水库) along the river to trap sand... Plateau is hard. But now we have lots of hi-tech tools to help!Planting trees on the Loess Plateau ……