单项选择题

A．From rocks in the mountain.
B．From the remains of ancient sea life.
C．From the soil under the sea.
D．From ancient trees.
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单项选择题
A．Because nationals are extremely strict in choosing journalists.B．Because nationals have already employed many journalists.C．Because nationals pay little salary.D．Because nationals seldom recruit inexperienced employee.
A．Because nationals are extremely strict in choosing journalists.
B．Because nationals have already employed many journalists.
C．Because nationals pay little salary.
D．Because nationals seldom recruit inexperienced employee.
单项选择题
A．He worked for a medical periodical.B．He published a paper about computer science.C．He suggested a link between smoke and lung cancer.D．He opened a hospital with his partner.
A．He worked for a medical periodical.
B．He published a paper about computer science.
C．He suggested a link between smoke and lung cancer.
D．He opened a hospital with his partner.
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