Passage: As a roller coaster puts the body through weightlessness

Answer: .........false.........

21. 
    Passage: If the bark is stripped on a day when it's too cold - or when the air is damp - the tree will be damaged.
    

Question: Cork bark should be stripped in dry atmospheric conditions.

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

22. 
    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........

23. 
    Passage: The pyramids of Egypt were built more than three thousand years ago, and no one knows how. The conventional picture is that tens of thousands of slaves dragged stones on sledges.
    

Question: It is generally believed that large numbers of people were needed to build the pyramids.

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

24. 
    Passage: Despite popular belief that sleep is one long event, research shows that, in an average night, there are five stages of sleep and four cycles, during which the sequence of stages is repeated.
    

Question: The various stages of sleep occur more than once a night.
Answer :True..............

25. 
    Passage: As president, he organised the purchase of a vast tract of land from the French, who were embattled in Europe and strapped for cash. This land, called the Louisiana Territory, doubled the size of America.
    

Question: During Jefferson's presidency, the French bought some American land, greatly reducing the size of the country.

Answer: ..False................

26. 
    Passage: Global warming is the gradual heating of Earth's surface, oceans and atmosphere. Scientists have documented the rise in average temperatures worldwide since the late 1800s. Earth's average temperature has risen by 1.4 degrees Fahrenheit (0.8 degrees Celsius) over the past century, according to the Environmental Protection Agency (EPA).
    

Question: The consumption of fossil fuels in last few decades has contributed much to the degradation of our environment.