Lesson 18 Grade Four Volume I "The Story of Vitamin C"

Columbus was a great Italian navigator in16th century. He often leads his fleet to sail and explore in the Atlantic Ocean.

At that time, sailing life was not only very hard, but also full of dangers. The crew can only eat brown bread and salted fish on board. The most terrible thing is that it is easy to get strange diseases during the voyage. The patient first feels weak and can't walk, then he will bleed all over and then die slowly. The crew called this a strange disease? A sea monster? .

Once, the fleet set out again. Soon? A sea monster? It came quietly. Less than half way through the voyage, a dozen crew members fell ill. Looking around the vast sea, Columbus's heart was very heavy.

Those seriously ill crew members said to Columbus in order not to drag everyone down. Captain, please take us to a nearby desert island. When you return to China, you can transport our bodies back to your hometown. ? Columbus (q? N) nod with tears.

Several months passed, and Columbus's fleet finally returned home successfully. The ship is getting closer and closer to the desert island where the seriously ill crew is located, and Columbus's mood is getting heavier and heavier. The success of this expedition was bought with the lives of more than a dozen crew members! Columbus thought so, and before he knew it, the ship had landed.

Just then, a dozen unkempt people ran from the island to the sea. Isn't this the crew? They are still alive! Columbus asked in surprise. How did you survive? When we arrived at the island, we ate up your food soon. Later, when we were hungry, we had to pick some wild fruits to eat. In this way, we can survive day by day. ?

? Did Columbus really tell the doctors about the miracle of these sailors coming back from the dead after he returned? Later, after research, it was found that wild fruits and other fruits and vegetables contained a substance called vitamin C, which saved the lives of those sailors.

So, the so-called? A sea monster? Is it? Scurvy is caused by a long-term lack of vitamin C in the human body. When the body supplements the right amount of vitamin C, scurvy will be cured.

Textbook analysis

This paper tells the story of Columbus, a great Italian navigator in the 6th century/Kloc-A.D., who led his fleet through the Atlantic Ocean. During his voyage and exploration, more than a dozen crew members got it. A sea monster? This disease, but they miraculously revived on a desert island. Thus, the existence of vitamin C was discovered and cured for human beings? Scurvy found a way.