Because of the development of agriculture, the area of land affected by sand has gradually increased. During the 1950s and 1960s the land affected by sand expanded on average into 1,600 square kilometers per year. By the 1990s, the area had reached 2,500 square kilometers per year. This kind of situation is particularly serious in many regions upwind(逆风的) from Beijing. Fengning City in Hebei Province and Duolun City in Inner Mongolia lie to the north of Beijing, and in the last 50 years the population of these two cities has grown by 2 to 3 times. In order to obtain more resources, the inhabitants have been busy with heavy farming, tree-cutting and keeping animals. The result is that the soil which has sustained damage, and the sand layer below the earth is now exposed on the ground and the ground is rapidly being controlled by the spread of sand.

China has already noticed this problem, and has take measures to save the land. Nowadays, some land used for farming has returned to forestland and grassland. The Chinese government announced that it would invest more than RMB 600,000,000 to control Beijing’s sandstorms in the coming years. Only by decreasing the damage caused by man and restoring the natural environment will it be possible to well control the sources of the sand and dust. We hope in the not-distant future, we will solve the problem successfully and effectively.

Exercise has an undeniable link to the development of better bodies. A recent study conducted by University of Delaware researchers found that speech-language therapy (疗法) improves children’s vocabulary growth. The study, which was published in the journal Journal of Speech-Language and Hearing Research, highlights one of the first studies on the impact of exercise on vocabulary learning in children.

Children ages 6 to 12 were taught new words before doing one of three things: swimming, CrossFit exercises, or coloring a sheet. In follow-up tests of vocabulary words, the children who swam were 13% more accurate.

It makes sense to the lead researcher, Maddy Pruitt, a former college swimmer who now attends CrossFit classes on a regular basis. "Motor movement aids in the encoding (编码) of new words, "she explained, adding that exercise has been shown to increase levels of brain derived neurotrophic factor (脑源性神经营养素), a protein Pruitt refers to as the “Miracle-Gro for the brain”.

So, why did swimming make a difference but CrossFit didn’t? Pruitt attributes it to the amount of energy required by the brain during each exercise. Swimming is an activity that children can do without much thought or instruction. While the CrossFit exercises were new to them, it was more automatic. The children had to learn the moves, which took mental energy.

“We were very excited about this study because it is applicable to clinicians, caregivers, and educators who can put it into practice,” Pruitt said. “It’s not anything out of the ordinary. However, it has the potential to significantly improve the outcomes.”

Gold Coast family holidays are always great fun whether you are from Australia or from abroad. There are beautiful beaches, adventure parks, nature parks and so many more.

There are so many sights to see here. It is a pity to drive in a car and you’ll miss a great part of it. Australia is home to many animals and birds that can only be seen when moving slowly and going into the areas where they live.

When you are on a bicycle, you have the advantage of being able to stop whenever you want to see an interesting animal or bird that you have never seen before. It is a quieter mode(方式) of transportation as well, so you might even be able to take a picture. When you are on the beach you can breathe that clean air and view the beauty of the water and sand. It is a totally different experience from either simply sunbathing or                    passing it in a car.

There are many choices of hiring a bicycle to experience the Gold Coast attractions. There are stores that will fit a bike perfectly to your size. These bikes for both adults and children are in many styles and colors to please any taste. If you have ever wanted to try a tandem bike(双人单车), now is your chance, because they have those too.

A bicycle hire on Gold Coast is something that everyone should try at least once. This is a wonderful chance for anyone who likes to cycle and it is also a cheap way to travel with your family.