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
A．Just so so.B．Quite good.C．Fewer than other jobs.D．None of them know the salary.
A．Just so so.
B．Quite good.
C．Fewer than other jobs.
D．None of them know the salary.
单项选择题
A．They published scientific evidence to determine second hand smoke as a cause of cancer.B．They denied the suspicion that second hand smoke may cause cancer.C．They discovered all the causes of cancer.D．They agreed that moderate smoke won’t cause cancer.
A．They published scientific evidence to determine second hand smoke as a cause of cancer.
B．They denied the suspicion that second hand smoke may cause cancer.
C．They discovered all the causes of cancer.
D．They agreed that moderate smoke won’t cause cancer.
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