单项选择题

In certain types of quartz, bands of color form an irregular pattern.

A．shades
B．cautioned
C．motivated
D．requested
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单项选择题
It is difficult to discern the sample that is on the slide unless the microscope is adjusted properly.
A．overlook
B．disclaim
C．discard
D．detect
单项选择题
Two more teams have dropped out of the league.
A．have promenaded down
B．have reprimanded for
C．have left permanently
D．have been absent
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