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【单选题】
在入侵报警系统中，通常所用的传感器中是利用以下那两种技术()A.
红外探测技术和光波探测技术；
B.
微波探测技术和无线电探测技术
C.
红外热能感应技术和微波探测技术
D.
热能感应技术和电场传感技术
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举一反三
【单选题】What does 'them' refer to in the sentence 'It sent them streaming westward into the wilderness after their predecessors to raise still more children who wanted still more land' ?
A.
Urban dwellers.
B.
Dollars and cents.
C.
Yearners.
D.
Predecessors.
【单选题】What does the word 'them' (in Paragraph . . how readers might use them) refer to?
A.
Shampoo.
B.
Artichokes.
C.
Publications.
D.
Readers.
【简答题】What does the speaker ask them not to do? The speaker asks them not to take ______ out of the forest with them.
【单选题】What does 'them' refer to in the sentence 'It sent them streaming westward into the wilderness after their predecessors to raise still more children who wanted still more land'?
A.
Dollars and cents.
B.
Urban dwellers.
C.
Predecessors.
D.
Yearners.
【单选题】What does "giving them cues" mean?
A.
giving them rhythm
B.
telling them when to do what
C.
telling them to stop
D.
telling them to get off stage
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