In the very distant geological past, all animals were aquatic. The very first vertebrates or animals with backbones, of which we have any fossil record, lived in water. These vertebrates, the fish, were adapted to underwater living. Their streamlined bodies were covered with scales to reduce surface friction: they had muscular tails so that they could swim swiftly in such a dense medium as water; and they were endowed with gills for breathing underwater. Descendants of fish-type ancestors crossed the seashore barrier and accommodated themselves to life on land. As amphibians, they possessed limbs instead of fins and lungs instead of gills. But they never became completely free of the bonds that tied them to the water; even today many amphibians return to the water to lay their eggs. Millions of years after the first clumsy amphibians crawled over the land, newer types of land dwellers appeared, these animals give rise to the present-day reptiles and mammals. They were completely converted for land dwelling, with bodies and biological activities far different from those of fish. With these special adaptations, mammals have been able to colonize the woods and meadows, the deserts and high mountains, often far removed from the sea.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions

Of the animals with backbones, the first to appear were ______

Câu hỏi liên quan

• The word “it” in the second paragraph refers to ________.

• Why does the author mention "artistic, political, or pedagogic communication" in line 14-15?

• The word “mechanisms” in paragraph 1 is most likely ________.

ZUNIA12

• Which of the following best expresses the main idea of the second paragraph of the passage?

• According to the passage, where is a child's lost tooth thought to be taken away by a mouse?

• What does the passage mainly discuss?

• The word "Here" in line 9 refers to ............

• According to the passage, what makes mobile phones potentially harmful is ______.

• People need to communicate in order to .............

• The word “lies” in the first paragraph could be best be replaced by ______.

• The word “these” I the first paragraph refers to .............

• When she published her first book, Carson was closest to the age of .........

• The best title of the passage could be ______.

• "It” in the passage refers to_______.

• Did the town people believe the story of the five men about their meeting with Bigfoot?

• The word ‘monumental’ in Paragraph 2 means __________.

• The word “Nevertheless” in line 19 is closest meaning to _________ .

• What is the main topic of the passage?

• Which of the following could be considered a cause of the distress signals of trees?

•  In what way is Juliette’s current job better her first job?