Most people have flown a kite or have seen one ride and dip(下降）in strong spring wind. Not so many people know that kites were first made in China thousands of years ago. The ancient Chinese were making and flying kites even before they were writing.

    A long time ago, the Chinese made kites to use in wars. They would fly these war kites in the dark. The kites were fixed(固定）so that they made strange sounds. Men at war would hear these sounds and run away. They thought those strange sounds were made by gods in the sky.

    The ancient Chinese also flew kites to bring good luck and to make their crops grow rich and tall. Sometimes they tied long strings(细绳）and hooks(钩) to their kites. Then they would fly the kites over water, letting the hooks hang down to catch fish.

    The Chinese use sticks(树枝), strings and paper for their kites. Some of these kites look like animals or trees. Others look like birds or houses.

刘大爷退休后坚持锻炼，身体棒棒的，但最近一到傍晚就看不清东西，到医院检查后，医生给他开了药，还要求他进行食物辅助治疗．他需要的食物是（　　）

在草稿纸上计算：① ；② ；③ ；④ ，观察你计算的结果，用你发现的规律直接写出下面式子的值： =____．

①—④句填在横线上，顺序最恰当的一项是（    ）
时间也真是不可捉摸，                    ，诸如此类，都显示时间的印痕。
①例如撕去的日历、飘落的秋叶、老人的白发、美女眼角的鱼尾纹
②然而，时间却又无处不在，无往而不在
③随手掇拾几个生活细节
④无形无影，无声无息，无光无色