【单选题】Thomas wanted to find a use for chicle. C hicle is a Spanish word for sticky water that comes from one kind of tree grown in Mexico. Thomas wanted to make rubber from chicle. What was Thomas trying to...
【单选题】The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid (...
【简答题】阅读理解。 Thomas Adams discovered bubble gum (泡泡糖) in the 1870s. He was an American. He wanted to find a use for chicle. Chicle is a Spanish word for sticky water that comes from one kind of Mexican tre...