单项选择题

A．Grade all the homework.
B．Clean the professor’s office.
C．Help the professor in the classroom.
D．Sort all the documents.
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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.
A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
单项选择题
A．The tuition fee is lower.B．It is more flexible.C．The professors are more famous.D．It helps to reduce traffic jams.
A．The tuition fee is lower.
B．It is more flexible.
C．The professors are more famous.
D．It helps to reduce traffic jams.
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