Engineers and designers have been using 3D printers for more than a decade, but mostly to make original types quickly and cheaply before they embark on the expensive business of tooling up a factory to produce the real thing. As 3D printers have become more able to work with a broader range of materials, including production-grade plastics and metals, the machines are increasingly being used to make final products too. More than 20% of the output of 3D printers is now final products rather than original types, according to Terry Wohlers, who runs a research firm specializing in the field. He predicts that this will rise to 50% by 2020.
1. Which of the following is true according to the passage?
A. Filton is in the centre of Bristol.
B. Peter tried to print a clock, but in vain.
C. a remarkable metal bracket is being created.
D. 3D printing technology is available to all of us.
2. The underlined word “embark” probably means “_________”.
A. work B. land C. depend D. fix
3. We can conclude from the last paragraph that __________.
A. Terry Wohlers’ s firm will make great profits
B. the technology of 3D printers will be widely adopted
C. 3D printers have been in use for at least 100 years
D. engineers and designers prefer printing original products
4. The passage is developed mainly in the form of _______.
A. time and events B. definition and description
C. contrast and conclusion D. examples and statements
【参考答案】1—4、 CABD
