单项选择题

A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
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单项选择题
A．Those who know how to program computers.B．Those who get special aid from their teachers.C．Those who are very hardworking.D．Those who have well-educated parents.
A．Those who know how to program computers.
B．Those who get special aid from their teachers.
C．Those who are very hardworking.
D．Those who have well-educated parents.
单项选择题
A．They look at a house sitter’s score report.B．They interview a house sitter’s friends.C．They check a house sitter’s references.D．They attend a house sitter’s party.
A．They look at a house sitter’s score report.
B．They interview a house sitter’s friends.
C．They check a house sitter’s references.
D．They attend a house sitter’s party.
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