It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to ensure that alternative materials are substituted whenever possible.
A: utilized
B: mobilized
C: acquired
D: cultivated
A: utilized
B: mobilized
C: acquired
D: cultivated
举一反三
- Have you not been on the London Eye? A: already B: yet C: still
- Which of the following statements is true（） A: Vegetables need to have as much shading as possible. B: A small garden is much better than a large one. C: Homeowners can freely choose the soil for their vegetable garden. D: Whenever possible, the vegetable garden should be close to your home.
- Which are the possible ways to protect our environment? A: To choose energy-conserving electrical appliances. B: To choose freon-free products. C: To take a bus as much as possible. D: To take a car as much as possible.
- Calculations, which are astronomically exact, have been made （） with the use of computers. A: possible B: it possible C: possibly D: to be possible
- Please take the necessary steps ______delay．