Part 4
Listen and answer questions Questions 31-36 / Questions 37-40
Questions 31-36
Questions 31-36 Complete the notes below. Write ONE WORD ONLY for each answer.
| Natural rubber production |
| “Tapping”—tree is cut and a layer of bark is removed. |
| Cup (e.g. made of a 31_________ shell) is attached to collect latex. |
| ↓ |
| Latex is transferred to the “factory”. |
| ↓ |
| Latex is poured into a 32_________ . |
| ↓ |
| Formic acid is added to thicken the latex. |
| ↓ |
| Rubber is 33_________by hand to make it into a thin sheet. |
| ↓ |
| Rubber sheet is put through a mangle. |
| ↓ |
| (N.B. the only 34_________ in the process) |
| ↓ |
| Rubber sheets are taken to be 35_________ in a special room. |
| ↓ |
| Rubber sheets are purchased by 36_________ . |
Questions 37-40
Questions 37-40 Write NO MORE THAN TWO WORDS for each answer.
History Of Rubber
| Earliest use |
| • 1525: rubber 37_________ were used in Mexico |
| 19th century |
| • Key discovery: “vulcanisation” made rubber stronger and 38_________ |
| • Increase in demand when rubber 39_________ were invented |
| 20th century |
| • Substitute for natural rubber was first developed in 40_________ during First World War. |
答案：
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