Written Chinese has also    1     which China’s present is connected with its past. People in modern times can read the classic works which were written by Chinese in ancient Times.    2     the Chinese writing system can be seen in the development of Chinese characters as an art form,    3    , which has become an important part of Chinese culture. Today, the Chinese writing system is still an important part of Chinese culture. As China plays a greater role    4    , an increasing number of international students are beginning, to appreciate China’s culture and history    5    .

The air is thin and we have to rest several times on the short hike from camp. To our left, snow-covered mountains    6    that seem almost close enough to touch. On the plain in front of us, we can just    7    a herd of graceful animals. This is why we’re here-- to observe Tibetan antelopes.

In the evening, I drink a cup of tea and watch the stars. I think about the antelopes and what Zhaxi told me.    8     to protect wildlife, but if we really want to save the planet, we must change our way of life. Only when we learn to exist    9    with nature can we    10    to wildlife and to our planet.

We have known about climate change for d    1    . There is little d    2     that Earth is getting warmer and warmer (see the graph). A warming ocean and atmosphere along with m    3     ice and rising sea levels provide evidence of a dramatic change in the global climate.

In 2013, a lot of people were s    4     by a news photo of a dead polar bear that was found on Norway’s Arctic island of Svalbard. A    5     to the scientists who found its dead body, all that remained of the polar bear was “skin and bones”. An expert who has studied polar bears for many years said that from the    6    of its dead body, the bear appeared to have s    7     and died. Experts claimed that low sea-ice levels c    8     by climate change meant the bear could not hunt seals as before, so it had to travel greater distances in order to find food. This alarming case s    9     how the increase in temperature had an i    10     on Earth’s ecology.