根据课文内容填空。
人类的生息离不开灰尘。假如大气中没有灰尘，________________；假如大气中没有灰尘，________________；假如空中没有灰尘，________________，更为严重的是，________________；假如空中没有灰尘，________________。
强烈的阳光将使人无法睁开眼睛 天空将始终是蔚蓝色的 地面上的万物都将是湿漉漉的 大气中的相对湿度不断上升，就会影响生物的生存 大自然也将会变得非常单调
阅读短文还原句子，其中有一多余选项
Playing sports can also help you keep fit. But sometimes it may cause accidents（引发事故）. _______2_______ Happiness is important for your health. _______3_____ When you are ill, try to be happy and you’ll feel better. On the other hand, you may feel sick if you are always unhappy. So, be happy to be healthy. ______4______. Many students thinks it’s cool to smoke and drink. But they don’t know smoking and drinking can cause many illness. You should say no to smoking and drinking. |