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English 12: Unit 10: Endangered species

Read the passage and choose the correct answer:

Whales, dolphins and porpoises belong to the family of marine mammals known as cetaceans. Unlike fish, cetaceans are air-breathing, warm-blooded mammals that bear live young and nurse them on milk. Cetaceans play an important role in the life of the ocean, serving as flagships for the health and well-being of the whole marine ecosystem.
Completely adapted to life in the water, whales breathe through blowholes on top of their heads, which allows them to take in air without interrupting swimming. Of the great whales, the deep-diving sperm whale is the champion at holding its breath. Unlike fish, which swish their tails from side to side, whales swim by pumping their tails vertically, and using their flippers to steer.
Along with hunting, collisions with ships, and the degradation of their habitat due to pollution, the greatest threat to whales, dolphins and porpoises is entanglement in fishing gear, also known as by catch. If current trends continue unabated, several cetacean species and many populations will be lost in the next few decades.


1. Dolphins, whales and sperm whales are known as ................
A. warm-blooded mammals
B. A & C are correct
C. important creatures of the ocean
D. dangerous marine animals
Explain:


2. Whales breathe through blowholes on top of their heads, ............... .
A. which helps them hunt food easily
B. which allows them to take in air without interrupting swimming
C. which makes them play an important role of the ocean
D. which is the same as cetaceans
Explain:


3. Sperm whales are considered as ............... .
A. the great whales serving mainly as flagships for the health
B. the champions at holding its breath in deep-diving
C. one of the cetaceans that don't breathe through blowholes
D. the only marine mammals that can bear live young and nurse them on mille
Explain:


4. According to the passage, it′s not true to say that ............... .
A. cetaceans have faced with many things such as people's hunting, collisions with ships and water pollution
B. the greatest threat to whales, dolphins and porpoises is entanglement in fishing gear
C. several cetacean species will be lost in the next few decades if the current trends are still so strong
D. whales, dolphins and porpoises will always exist whatever difficulties they may encounter
Explain:


5. The passage is mainly about ............... .
A. the extinction of cetaceans
B. a must for protecting cetaceans
C. the important role of cetaceans
D. the intelligence of cetaceans
Explain:
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