Word formation
For questions 1-8, read the text below. Use the word given in capitals at the end of some of the lines to form a word that fits in the gap in the same line.
基础词:
Much of the ocean floor has never been mapped in detail, and the deep sea remains one of the least 1. places on Earth. Some scientists say we know more about the surface of the Moon than about the bottom of our own oceans. Conditions down there are hard to imagine. There is complete 2., the water is close to freezing, and the 3. is great enough to crush a submarine that was not built for it. 4., life still manages to survive. Scientists have discovered 5. species that produce their own light, as well as fish with 6. large eyes and teeth that help them catch what little food there is. Almost every expedition brings new 7., and many of the creatures brought to the surface have never been seen before. Experts believe that the 8. of deep-sea species have yet to be identified, so the ocean's greatest secrets may still be waiting to be found.