Passive RFID tags chiefly consist of ______
A. scanning devices
B. radio waves
C. batteries
D. chips
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Road conditions in this area had gone from bad to worse. Accidents had taken place ______
A. by the way
B. in a row
C. in the way
D. in a line
According to the passage, hammocks ______.
A. cannot be rolled up
B. are difficult to transport
C. are never brought to the plantations
D. can be kept dry while the ground is wet
According to the author, teenage rebellion ______.
A. may be a false belief
B. is common nowadays
C. existed only in the 1960s
D. resulted from changes in families
The purpose of the passage is ______.
A. to introduce the culture of antique clocks
B. to offer some advice on collecting antique clocks
C. to compare different ways to make a future profit
D. to explain convenient and reliable ways of telling time
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