The author gives the example of Touchstone to show
A. the smart phone Pre has enough creativeness to be the star of the show.
B. intensified competition promotes the introduction of wireless charging.
C. big companies have been trying hard to promote wireless charging.
D. the Wireless Power Consortium has done a great job up till now.
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Which of the sentences below best expresses the information in the highlighted statement in the passage？ The other choices change the meaning or leave out important information.
A. Life on Mars was found as a result of research in many cases.
B. The evidence did not demonstrate that there was life on Mars in the past.
C. Many cases of life were concluded in the history of Mars.
D. The conclusion was that only one instance of life on Mars was verified.
Look at the four squares [■] that show where the following sentence could be inserted in the passage. Some historians believe they can be established. Where could the sentence best be added？ Click on a square [■] to insert the sentence in the passage.
A. Square Ａ.
B. Square Ｂ.
C. Square Ｃ.
D. Square Ｄ.
The word its in the passage refers to
A. copper
B. bronze
C. metal
D. iron
According to paragraph 2, what happens as societies become more prosperous？
A. More goods are produced.
B. Walled cities are built.
C. Laws are instituted.
D. The size of families increased.
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