To make human cells more mouselike scientists tried ______.
A. to subject them to two more genes
B. to keep the division from slowing down
C. to promote the production of telomerase
D. to prevent excessive ceils copying
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According to the passage, one is thought vicious when he ______.
A. gathers up money at the sacrifice of all his family members
B. practices endless thrifty to guard his people from poverty
C. stores continuously for his own and his relatives' needs
D. saves too much but wouldn't spend it for the necessary
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
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
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