What should you do if you want to make a cheaper daytime call？
A. ask the operator
B. change to DST
C. phone on Sunday
查看答案
A．forB．ofC．up
A. for
B. of
C. up
The words "in the comparative poverty of fifty millions" at the end of the passage suggests a notion that ______.
A. stinginess may cause a very rich man to die very pitiful
B. rich people may still take 50 million as comparatively little
C. one remains discontent with all he's gained until his death
D. the rich are inconsiderate of the majority that live in poverty
One key factor in creating tumor with human cells is ______.
A. lengthening the ends of chromosomes
B. altering the structure of telomeres
C. increasing the levels of telomerase
D. modulating the cell dividing process
A tachometer is an instrument that uses resonance to determine ______.
A. the speed of a motor in revolutions
B. the frequency at which a motor vibrates
C. the amplitude of an engine that oscillates
D. the changes in a dial within a car engine
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