A It was wrecked during the mission. B It was recovered after its return to Earth. C It stayed in the moon's orbit. D It disappeared in the outer space.

A They showed abnormal behaviors. B They had serious liver problems. C They lost their appetite for food. D They had obviously lost weight.

A The tortoises were fond of seeing Earthrise. B The tortoises were not given due credit for their experience. C The tortoises were not named after the Soviet spacecraft. D The tortoises were famous all over the world.

A A person who likes to grow vegetables. B A person who is fond of eating meat. C A person who keeps a plant-based diet. D A person who stays away from animals.

A Eggs. B Honey. C Milk. D Potatoes.

A Animals can help improve the environment. B Animals have the right to life and freedom. C Animal products lead to the rise of grain output. D Animal products are far more nutritious.

A Going vegan consumes more water and grain. B Going vegan enables people to live a healthier life. C Going vegan helps to develop meat industry. D Going vegan has been a lifestyle for the majorities.

A BP has earned a lot of money by selling plastic products. B Cutting back on plastic use may bring more problems. C BP has become one of the world's biggest oil companies. D Cutting back on plastic use may affect product quality.

A Second-hand cotton begs. B Reusable paper bags. C Single-use plastic bags. D Recyclable glass bottles.

A Its consideration of its own interest. B Its worry about the loss of consumers. C Its desire to influence world economy. D Its concern about the environment.