教甄◆英文科題庫下載題庫

1. Historically, Bristleworms have had a bad reputation among saltwater aquarium aficionados. These marine worms usually enter the hobbyist's aquarium by __21__ a ride on a piece of coral. Once established, they become part of the tank's ecosystem. Bristleworms ___22___ greatly in size. The smallest ones are about an inch long, and the large ones can grow to over 20 inches, although, being segmented, their bodies are often ___23___ and so not usually seen at their greatest extent. Literature has frequently __24__that bristleworms are harmful, asserting that they eat clams, anemones and even coral fish. However, most enthusiasts now conclude that small bristleworms __25__ no threat, and are merely scavengers, clearing the tank from detritus and carcasses of animals that are already dead. However, larger worms, particularly those of the species known as fireworms, are __26__eaters and can do irreparable damage. These worms are better removed, although this is a challenge in itself, as the worms are nocturnal, sensitive to light and will go into hiding at the slightest disturbance.