Question

The world's oceans cover more than 70% of the planet's surface. They produce over half of the oxygen we breathe and absorb large amounts of carbon dioxide. Furthermore, marine life forms the base of the food chain, supporting countless species, including humans. Despite their massive size, ocean ecosystems are fragile and require protection from pollution and overfishing. Which statement best expresses the central idea of the passage?
A. Ocean ecosystems are fragile and threatened by pollution and overfishing.
B. Marine life provides the foundation for the global food chain.
C. The world's oceans are vital to life on Earth and must be protected from harm.
D. The oceans cover the majority of the Earth's surface.
2. Artificial Intelligence (AI) is already integrated into many parts of daily life. Smartphone assistants, personalized streaming recommendations, and spam filters all rely on AI algorithms. This technology helps to automate repetitive tasks, allowing humans to focus on more complex, creative, or interpersonal problems. While there are concerns about job displacement, the current trend shows AI is primarily a tool to enhance human productivity and efficiency. What is the central idea of this passage?
A. Smartphone assistants and streaming services rely on AI algorithms.
B. AI is an omnipresent technology that largely functions to support and improve human efficiency.
C. AI is a new technology that has not yet been fully developed for daily use.
D. AI is a complicated technology that may cause job displacement in the future.

3. A group of scientists recently discovered a hidden chamber inside the Great Pyramid of Giza using cosmic-ray imaging. This non-invasive technique relies on detecting tiny particles that pass through rock. The discovery does not suggest any immediate change to the pyramid's historical interpretation, but it does validate a new method for exploring ancient structures without causing physical damage. Which option is a supporting detail rather than the central idea?
A. The discovery validates a new method for exploring ancient structures without damage.
B. A new, non-invasive technology was used to make an archaeological discovery.
C. A hidden chamber was found inside the Great Pyramid of Giza.
D. The discovery does not immediately change the historical interpretation of the pyramid.

Answer 1

1. C — The passage emphasizes the oceans' vital role for life and the need to protect them.

2. B — The passage's main point is that AI is widespread and primarily supports/improves human efficiency.

3. D — That the discovery doesn't change the pyramid's historical interpretation is a supporting detail, not the central idea.