TOEFL Exercise for Paper-based Exam #1
Test your skills in reading comprehension, vocabulary, and grammar!
Reading Passage
The Mysteries of Deep-Sea Exploration
Deep-sea exploration remains one of the most intriguing frontiers of scientific research. Covering over 70% of Earth’s surface, the ocean holds countless secrets, many of which lie in its deepest trenches. Advances in technology, such as remotely operated vehicles (ROVs) and submersibles, have enabled scientists to explore regions of the ocean once thought to be unreachable. These discoveries have revealed an array of unique ecosystems thriving under immense pressure, in total darkness, and without sunlight.
One of the most remarkable findings in deep-sea exploration is the presence of hydrothermal vents. These underwater geysers release mineral-rich fluids heated by the Earth’s core, creating a unique habitat for organisms that rely on chemosynthesis rather than photosynthesis. Giant tube worms, deep-sea crabs, and bioluminescent shrimp are just a few examples of species that flourish in these extreme environments.
Despite these advances, challenges remain. The ocean’s depth and immense pressure make exploration risky and expensive. Additionally, deep-sea mining poses a new threat to these fragile ecosystems. Researchers stress the importance of balancing technological progress with environmental conservation to ensure the sustainable use of ocean resources.
Reading Comprehension
Question 1: What has enabled scientists to explore previously unreachable parts of the ocean?
Question 2: What is the main source of energy for organisms near hydrothermal vents?
Question 3: What is the main environmental concern related to deep-sea mining?
Question 4: Why are hydrothermal vents considered unique?
Vocabulary
Question 5: The word “immense” in the passage is closest in meaning to:
Question 6: The word “fragile” in the passage is closest in meaning to:
Question 7: The word “revolutionized” in the passage is closest in meaning to:
Grammar
Question 8: Identify the error in this sentence: “Each of the scientists are presenting their findings at the conference.”
Question 9: Choose the correct sentence:
Question 10: Identify the sentence that contains no errors:
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