Passage: As a roller coaster puts the body through weightlessness

Answer: .......true…

15. 
    Passage: The ancestors of the Inuit people of Greenland are thought to have lived in Siberia- the vast eastern region of modern Russia- until 7,000 or 8,000 years ago. There is evidence that they then travelled by boat into Alaska, setting in the northerly part of North America. From there, some
    

migrated to Greenland around 5,000 years ago, and evidence has been found of their existence around the northern tip of the island.
Question: The north of Greenland was the most attractive area of the island for the earliest settlers.

Answer: ...not given..…

16. 
    Passage: Recent discoveries offer some evidence that black holes have a dramatic influence on things around them, emitting powerful gamma ray bursts, absorbing nearby stars, and both stimulating and hindering the growth of new stars.
    

Question: Black holes can actually help the creation of new stars.

Answer true ........

17. 
    Passage: Cork harvesting is a very specialized profession. No mechanical means of stripping cork bark has been invented, so the job is done by teams of highly skilled workers.
    

Question: The only way to remove the bark from cork oak trees is by hand.

Answer: true.........

18. 
    Passage: She angered me with her inappropriate comments, rumor- spreading, and disrespectfulness at the formal dinner table.
    

Question: Her impoliteness, gossiping, and general lack of respect at dinner infuriated me.

Answer: true............

19. 
    Passage: Cork - the thick bark of the cork oak tree (Quercus suber) - is a remarkable material. It is tough, elastic, buoyant, and fire-resistant, and suitable for a wide range of purposes.
    

Question: The cork oak has the thickest bark of any living tree.

Answer: ......not given.........…

20. 
    Passage: The bark of the cork oak has a particular cellular structure - with about 40 million cells per cubic centimetre - that technology has never succeeded in replicating.
    

Question: Scientists have developed a synthetic cork with the same cellular structure as natural cork.