单项选择题

A．They have been working at the telescope for two days.
B．They can’t find the microscope.
C．They’ve been working in the laboratory for two hours.
D．They can’t fix the microphone.
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单项选择题
A．A good salesman should develop personal relationship with the customer first.B．Grasping certain selling techniques is a must for a salesman.C．A good salesman should adjust himself to different cultures.D．A good salesman should know how to make use of trade shows.
A．A good salesman should develop personal relationship with the customer first.
B．Grasping certain selling techniques is a must for a salesman.
C．A good salesman should adjust himself to different cultures.
D．A good salesman should know how to make use of trade shows.
单项选择题
A．Because the state of California is much larger.B．Because the electronic signal travels faster in Mexico.C．Because the quake’s shock waves are stronger in California.D．Because quake centers are much closer to population centers in California.
A．Because the state of California is much larger.
B．Because the electronic signal travels faster in Mexico.
C．Because the quake’s shock waves are stronger in California.
D．Because quake centers are much closer to population centers in California.
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