No sooner had he sat down to lunch____there was a knock at the door.

单项选择题This kind of computer is____. handling all kinds of information.

单项选择题According to the passage, American electronic waste is exported to other countries because these countries have（）

A．the resources and more space to process the e-waste
B．less strictly enforced environment safety standards
C．a lot of skilled e-waste workers
D．many computer recycling businesses