A．called uponB．switched toC．rolled outD．went through
A. called upon
B. switched to
C. rolled out
D. went through
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There could be no real cattlemen in Matt's Saloon on Saturday night, because ______.
A. Matt's Saloon caters to guests from Europe instead of cattlemen.
B. the ranchers dislike this impudent tourism.
C. it is too costly to afford for cattlemen.
D. it is tough to earn a living in that city.
According to the passage, which of the following is true？
A. Water problems in US are not optimistic, either.
B. Clean, safe, inexpensive water no longer meet American peoples' needs.
C. Water service's privatization is not necessary for the US.
D. Investment for water is not enough in the US.
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.
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.
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