The products have been ________ to strict tests before leaving the factory.
举一反三
- All products have to pass ______ inspection before they go out. A: strict B: flexible C: casual D: unnecessary
- All products have to pass strict inspection ( )they go out. A: after B: B. since C: as D: D. before
- Extensive tests have been ____ on the patient.
- ______ so many people put of work as today. A: Before have never there been B: There have been never before C: Never before have there been D: Have there never before been
- Opponents to genetically modified foods encourage scientist and policy makers to apply the precautionary principle to the approval of new products. What does this principle require? A: Research shows that the benefits outweigh the risks associated with the product. B: Tests on rodents have shown that the products are not a carcinogen. C: Research has demonstrated proof of no harm before products are approved. D: The facilities that manufacture the product have been inspected and are certified.