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Read the text below and answer questions 19-22

It was previously believed that dinosaurs were cold-blooded creatures, like reptiles. However, a recent discovery has led researchers to believe they may have been warm-blooded. The fossilized remains of a 66 million-year-old dinosaur’s heart were discovered and examined by x-ray. The basis for the analysis that they were warm-blooded is the number of chambers in the heart as well as the existence of a single aorta. Most reptiles have three chambers in their hearts, although some do have four. But those that have four chambers, such as the crocodile, have two arteries to mix the oxygen heavy blood with oxygen-lean blood. Reptiles are cold-blooded, meaning that they are dependent on the environment for body heat. Yet the fossilized heart had four chambers in the heart as well as a single aorta. The single aorta means that the oxygen-rich blood was completely separated from the oxygen-poor blood and sent through the aorta to all parts of the body. Mammals, on the other hand, are warm-blooded, meaning that they generate their own body heat and are thus more tolerant of temperature extremes. Birds and mammals, because they are warm blooded, move more swiftly and have greater physical endurance than reptiles.

19. The word they in the second sentence refers to … .

A) researchers B) discoveries C) reptiles D) dinosaurs

20. According to the author, what theory was previously held and now is being questioned?

A) That dinosaurs were warm-blooded         B) That dinosaurs had four-chambered hearts

C) That dinosaurs were swifter and stronger than reptiles      D) That dinosaurs were cold-blooded

21. The author implies that reptiles … .

A) have four-chambered hearts         B) have one aorta

C) are cold-blooded     D) are faster and have more endurance than mammals

22. The author implies that birds … .

A) move faster and have greater endurance than reptiles

 B) move slower and have less endurance than reptiles

C) move faster and have greater endurance than dinosaurs

D) move slower and have less endurance than dinosaurs

New words

Dinosaurs - Dinozavrlar

Cold-blooded  – Sovuq

Discovery  – Kashfiyot

fossilized remains  =  qoldiqlari

warm-blooded-  issiq qonli

chambers in the heart = yurakdagi kameralar

oxygen-lean blood – kislorodga boy qon

environment – atrof-muhit

Mammals  – Sutemizuvchilar

Thus  -Shunday qilib

Physical endurance jismoniy chidamlilik

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