Ⅲ Reading comprehension.

For years, scientists thought all life on Earth depended on energy from the Sun. During a process called photosynthesis, plants use energy from sunlight to make food and to put oxygen into the atmosphere. Creatures needing oxygen use that to breathe. Sunlight also provides the warmth that life needs.
Recent discoveries, however, have changed what scientists think about life. They have found worm - like creatures living around hydrothermal vents on the ocean floor. These creatures do not depend on the Sun or plants for food and energy. The animals living around hydrothermal vents eat bacteria that live on or below the ocean floor. The bacteria get energy through a process called chemosynthesis. Hydrothermal vents spit warm water filled with chemicals from inside the Earth. The bacteria use these chemicals as a source of food and energy.
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() 1. Which discovery changed how scientists think about life on Earth?
A. Europa.
B. Chemosynthesis.
C. Lake Vostok.
D. Photosynthesis.
() 2. What can you learn from the diagram?
A. Sunlight is the most important to all the living creatures on the Earth.
B. Scientists think finding life outside the Earth would seem less likely.
C. In both of the two chains, creatures get energy from inside the Earth.
D. There are two kinds of food chains: photosynthesis and chemosynthesis.

B
D