Read the text carefully. For each question, choose the correct answer.
1. Perhaps because of their constant presence, most of us rarely think of the importance of trees in our life. We may take them for granted, or see them as just decorations. Trees, however, benefit our environment and provide us with medicines. They provide shade in summer and shelter in winter. In fact, trees planted around our homes help reduce heating and cooling costs. During summer, trees can block the sun and have a refrigerating effect on us and our homes. During the winter months, trees can keep us warmer by protecting us from wind and snow. Trees also absorb harmful chemicals such as carbon monoxide and in turn give off oxygen. Moreover, they filter and trap pollutants such as smoke, dust, and ash making our air cleaner.
2. Apple, pear, and orange trees are just a few of the types of trees that provide us with nourishment. In addition to food, trees are also a constant source of medicine for the human race. For centuries, the Chinese have used tea made from ginkgo seeds as a cure for breathing illnesses. In more modern times, ginkgo leaf extract has been used as a treatment for Alzheimer's and depression. The Native Americans use Aspen bark for reducing fever and fighting influenza.
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