单项选择题

A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
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单项选择题
What do American parents expect their children to acquire in school
A．Profound knowledge of the world.
B．Practical abilities for future career.
C．The habit of thinking independently.
D．The confidence in intellectual pursuits.
单项选择题
A．He can’’t find his office key.B．He has misplaced some exams.C．He is unable to talk.D．He doesn’’t like his classroom.
A．He can’’t find his office key.
B．He has misplaced some exams.
C．He is unable to talk.
D．He doesn’’t like his classroom.
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