Read the following passage about camera traps and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 23 to 30.
Technology is being used more and more in video and photography. For example, wildlife photographers sometimes use camera traps. When a photographer uses a camera trap, the camera is hidden-for example, in a tree or on the ground - so the animals cannot see it. When an animal moves near the camera, the camera is turned on and it takes a photo or a short video. Sometimes, the camera is attached to an animal so it can take a video as the animal moves. The video then helps us to learn much more about the animal's life.
Photo engineers at National Geographic design camera traps to help photographers hide cameras - for example, in birds' nests or on the ocean floor. They've designed camera traps for National Geographic photographers like Steve Winter, who takes photos of wild animals such as tigers, leopards, jaguars, and bears. The animal looks straight into the camera. Steve thinks that if people see good photos of wild animals, they'll understand more about the animals and want to safeguard them.
Photo engineers have to design cameras that will not break when they're being used in places like jungles or the ocean. Sometimes, photographers use small remote-controlled cars to carry cameras.
Technology is always improving, and it's helping photographers to take amazing photos. Thanks to the technology of camera traps, we can all see the world in new and interesting ways.
