单项选择题 As mainstream chip production technology shifts from one generation to the next every three to five years, plants with new technology can make more powerful chips at lower costs, ______plants with outdated equipment, which often cost billions of dollars to build, will be marginalized by the maker.

单项选择题 The touch excites no defensive response unless the approach is from above where the spider can see the motion, ______on its hind legs, lifts its front legs, opens its fangs and holds this threatening posture as long as the object continues to move.

单项选择题 Here, so profligate has its use become the air conditioner is almost______the automobile of the national tendency to overindulge in every technical possibility, to sue every convenience to such excess that country looks downright coddled.