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【单选题】
已知集合A={0,1,2,3}及A上的二元关系R和S分别是R={(i,j)|j=i+1或j=i/2},S={(i,j)|i=j+2},则R°S是( )。A.
{(0,1),(1,2),(2,3),(0,0),(2,1)}
B.
{(2,0),(3,1)}
C.
{(0,1),(1,2),(3,2,3),(0,0),(1,2)}
D.
{(1,0),(2,1)}
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【单选题】--Tom, this is my new friend Jack. --___ _____
A.
Nice to meet you
B.
Thank you
C.
Good afternoon
【简答题】Jack is my new classmate. He lived in a small village for fif years. His father, Mr. Brown, was a rich farmer. Last year his father opened a shop in our town and last month he bought a big house a...
【单选题】He is really considering ___( )___ himself to educating these children often poor mountain village.
A.
to devote
B.
devoting
C.
devoted
D.
devote
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