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3. Define the main idea of paragraphs D and I. Find supporting details that help to develop the main idea.
Complete the sentences with the best option.
1. A rocket is a vehicle which obtains ____ by the reaction to the ejection of fast moving fluid from within a rocket engine.
a) lifting force b) thrust c) power
2. A chemical reaction in a chemical rocket is initiated between the fuel and the oxidizer _______.
a) in the nozzle b) in the vehicle c) in the combustion chamber
3. When the stages run out of propellant they are jettisoned _______ the rocket.
a) to accelerate b) to assist with lift-off c) to slow down
4. Rockets are particularly useful _____.
a) because of light weight b) at high altitudes c) at very high speeds
5. In stacked staging schemes the first stage is _____ and is usually the largest, the second stage is above it.
a) at the top b) at the bottom c) not dropped off
Work in group. Ask your partners questions concerning the contents of the text.
Vocabulary Focus
A) Match the synonyms.
A B
vehicle booster
fluid engine
launch vehicle aircraft
artificial fuel
govern begin
obtain liquid
propellant man made
initiate get
motor control
B) Make up your own sentences with the words from the column B.
In the text find the words with the meaning opposite to these phrases.
Efficient, heavy (B); solid, to decrease (C); deceleration (D); to separate, unusual (F); previous, to prevent (H).
A) Make sure that you know the meaning of the following verbs.
To obtain, to explore, to compare, to achieve, to propose, to determine, to exert, to require, to mount.
B) Make up your own word combinations using these verbs.
Give your own definitions for the words from the text.
Combustion chamber, rocket stage, propellant, booster, vacuum, exhaust velocity, orbit.
Fill in the table with the proper part of speech derived from the word given.
| Verb | Noun | Adjective (Participle) |
| ejected | ||
| explore | ||
| propulsion | ||
| achievement | ||
| equal | ||
| determination | ||
| initiated | ||
| acceleration | ||
| attach | ||
| container |
Speaking
In small groups summarize the main idea of the text and make a short report for your group mates.
2. The history of rockets goes back to the 13th century. People have developed a lot of original designs for different purposes. You are to prepare a report on the subject for your group mates. Find out some additional information for your topic.
Writing
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