Mercury Seven are astronauts.
举一反三
- Which of the following stars does not belong to the Seven Luminaries? A: Mercury B: Mars C: Jupiter D: Vega
- The Vega and Altair, together with five major stars, Mercury, Mars, Jupiter, Venus, and Saturn, are called the Seven Luminaries.
- The Vega and Altair, together with five major stars, Mercury, Mars, Jupiter, Venus, and Saturn, are called the Seven Luminaries.
- Exercise 1Directions: You will hear an interview of Chinese astronauts. Choose the best answer to each question.1.Which of the following statement is false? A: It’s difficult to dock two space crafts together B: Astronauts should do simulations many times before docking C: Astronauts should practice two years before docking D: Astronauts should practice two hours before docking
- Mercury is a metal pollutant that can disrupt the ecosystem. Why is mercury so disruptive to the ecosystem? A: Organisms excrete the mercury out as waste. B: Organisms use mercury as an enzyme to speed up reactions in an organism's body. C: Mercury slows down the respiration rates of primary consumers. D: Mercury can become concentrated in the tissues of organisms.