According to the passage, stem cells refer to ______.
A. cells that can become brain cells, blood cells or many other kinds of cell.
B. cells that can become what they want to be pretty much any other type of cell.
C. cells that are uncertain to become blood cells or brain cells when they grow up.
D. cells that have not decided when they grow up.
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When a traveler is in an unfamiliar place, ______.
A. mobile roaming will meet his needs.
B. he wants to know something about it.
C. Location-based services play a key role in his traveling.
D. he must understand the roles of Location-based services.
Who will most probably accept private sector in water treatment？
A. Government.
Banks.
C. Lobby.
D. Engineers.
Which of the following is the best title of the passage？
A. Water Shortage in Saudi Arabia and Algeria
B. Privatization Trend of Water's Investment
C. Water Crisis Looms Worldwide
D. The Future of Water Industry
It is implied in the passage that______.
A. some animals may also have the same ability to use language as human beings
B. human beings, unlike many other animals, no longer have such features as great strength, claws, long teeth and other defenses
C. there seems to be nearly no difference between human beings and other animals
D. monkeys and chimps seem to have more in common with human beings than any other animals
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