阅读理解。 Do's and Don'ts in Whale (鲸) Watching The Department of Fisheries and Oceans has developed guidelines for whale watching in Johnston Strait, where killer whales are found on a daily basis each summer. It is strongly recommended that vessel (船只) operators follow these guidelines for all kinds of whales. ● Approach whales from the side, not from the front or the back. ● Approach no closer than 100 metres, then stop the boat but keep the engine on. ● Keep noise levels down-no horns, whistles or racing of engines. ● Start your boat only after the whales are more than 100 metres from your vessel. ● Leave the area slowly, gradually moving faster when you are more than 300 metres from the whales. ● Approach and leave slowly, avoiding sudden changes in speed or direction. ● Avoid disturbing groups of resting whales. ● Keep at low speeds and remain in the same direction if travelling side by side with whales. ● When whales are travelling close to shore, avoid crowding them near the shore or coming between the whales and the shore. ● Limit the time spent with any group of whales to less than 30 minutes at a time when within 100 to 200 metres of whales. ● If there is more than one vessel at the same observation spot, be sure to avoid any boat position that would result in surrounding the whales. ● Work together by communicating with other vessels, and make sure that all operators are aware of the whale watching guidelines. 1. For whom is this text written? A. Tour guides. B. Whale watchers. C. Vessel operators. D. Government officials. 2. When leaving the observation areas, the vessel should _____. A. move close to the beach B. increase speed gradually C. keep its engine running slowly D. remain at the back of the whales 3. When going side by side with whales, the vessel should _____. A. keep moving in the same direction B. surround the whales with other boats C. travel closer and closer to the shore D. take a good viewing position 4. What is the shortest safe distance from the whales? A. 400 metres. B. 300 metres. C. 200 metres. D.100 metres.