Duolingo English Test Practice Test 4

Even in the driest desert, seeds may lie dormant for years, waiting patiently for a single heavy sho. After weeks of stormy weather, the first bright morning felt like a small but genu gift to everyone in town. Although electric scooters are convenient, several cities have banned them from pavements after a rise in accid. Without a doubt, the most valuable advice my first boss gave me was to admit my mist quickly. Tucked between two high-rise offices, the tiny chapel has stood since 1789, and nobody has ever dared to demo it. Contact lenses must be removed before swimming, since bacteria in pool water can cause a painful inf.

As old computers and game consoles slowly break down, many classic video games are now in real danger of disappearing forever. Original cartr and discs degr over time, and the companies that made the hard often stopped producing spare parts decades ago. Dedicated archi carefully extract the code from age cartridges and store it safely on modern serv before the physical origi fail completely. Museums and universities are increasingly treating early video games as important cultural artef, wor of the same careful preser as old films or paintings.

Few animals are as skilled at hiding as the octopus. Within a fraction of a second, it can change the colour, pattern and even the texture of its skin to match a rock, a patch of sand or a bed of coral. This ability comes from thousands of tiny organs called chromatophores, each one a small sac of coloured pigment surrounded by muscles. When the muscles Select…contractcontractscontracting, the sac stretches and the colour becomes visible; when they relax, the colour almost disappears. Beneath the chromatophores lie other layers that can reflect light or add a shimmering, iridescent quality. Together, these layers let an octopus Select…produceproducedproducing a staggering range of appearances in under a second. What is more remarkable is that octopuses are believed to be colour-blind, so scientists still argue about how the animal matches colours it may not consciously see. One theory suggests that light-sensitive cells in the skin itself help guide the change, working almost independently of the eyes and brain. The octopus can also raise small bumps called papillae to copy the rough texture of coral or the ridges of a rock. Predators such as sharks and dolphins are often fooled completely, swimming past an octopus that Select…isbeingbeen sitting in plain sight. Divers, too, have Select…describeddescribedescribing watching a boulder come suddenly to life and swim away.