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Câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the questions from 35 to 42.
Songs of the Humpback Whale
One amazing characteristic of the humpback whale is its ability to sing. A male humpback whale may sing individually, or it may sing in concert with other nearby male humpback whales. One song can last as long as 15 minutes, and it can be made up of as many as seven themes that are used repeatedly throughout the song. The song consists of low moaning sounds, blasts that sound like horns, and high squeals.
There is a lot that scientists know about the songs of the humpback whale. However, some of the things are not known with certainty. They are how the humpback whales produce their songs, why they are singing the songs, and when and where the humpback whales sing.
It is unclear how humpback whales are able to produce sounds while they are singing. This is unclear because humpback whales do not have vocal cords. It is also unclear because their mouths are not moving while they are singing.
Something else that is not clear is the reason why humpback whales sing. When a male humpback whale begins singing, other male humpback whales respond. It is not female whales that respond. Perhaps the males are joining together to sing because they want female whales that are far away to hear them.
In addition to not understanding how and why humpback whales sing, scientists also do not understand fully when and where they produce their songs. Humpback whales from Alaska travel to Hawaii for the winter months of November through May, and then they return to Alaska. The whales rarely sing when they are in Alaska, but sometimes they do. They sing a lot more and a lot more often when they are in the waters of Hawaii.
The word "they" in paragraph 5 refers to
A. Humpack whales.
B. scientists,
C. songs.
D. winter months.
Songs of the Humpback Whale
One amazing characteristic of the humpback whale is its ability to sing. A male humpback whale may sing individually, or it may sing in concert with other nearby male humpback whales. One song can last as long as 15 minutes, and it can be made up of as many as seven themes that are used repeatedly throughout the song. The song consists of low moaning sounds, blasts that sound like horns, and high squeals.
There is a lot that scientists know about the songs of the humpback whale. However, some of the things are not known with certainty. They are how the humpback whales produce their songs, why they are singing the songs, and when and where the humpback whales sing.
It is unclear how humpback whales are able to produce sounds while they are singing. This is unclear because humpback whales do not have vocal cords. It is also unclear because their mouths are not moving while they are singing.
Something else that is not clear is the reason why humpback whales sing. When a male humpback whale begins singing, other male humpback whales respond. It is not female whales that respond. Perhaps the males are joining together to sing because they want female whales that are far away to hear them.
In addition to not understanding how and why humpback whales sing, scientists also do not understand fully when and where they produce their songs. Humpback whales from Alaska travel to Hawaii for the winter months of November through May, and then they return to Alaska. The whales rarely sing when they are in Alaska, but sometimes they do. They sing a lot more and a lot more often when they are in the waters of Hawaii.
The word "they" in paragraph 5 refers to
A. Humpack whales.
B. scientists,
C. songs.
D. winter months.
Câu trả lời dựa vào thông tin 'Humpback whales from Alaska travel to Hawaii for the winter months of November through May, and then they return to Alaska."
Đáp án A.