A fascinates AI scientists all over the world. B has remained popular for as long as 200 years. C involves some concerns raised by AI today. D has sparked serious ethical controversies.

A helps explain artificial intelligence. B can be misleading to robot making. C inspires popular sci-fi TV series. D is too limited for us to reproduce it.

A can hardly ever be found. B is still beyond our capacity. C causes little public concern. D has aroused much curiosity.

A affirmation. B skepticism. C contempt. D respect.

A AI's Future: In the Hands of Tech Giants B Frankenstein,the Novel Predicting the Age of AI C The Conscience of AI: Complex But Inevitable D AI Shall Be Killers Once Out of Control

A better businesses' revolutions with states. B put most online businesses in a dilemma. C make more online shoppers pay sales tax. D force some states to cut sales tax.

A have led to the dominance of e-commerce. B have cost consumers a lot over the years. C were widely criticized by online purchasers. D were considered unfavorable by states.

A hindered economic development. B brought prosperity to the country. C harmed fair market competition. D boosted growth in states' revenue.

A Internet  entrepreneurs. B Big-chain owners. C Third-party sellers. D Small retailers.

A gives a factual account of it and discusses its consequences. B describes the long and complicated process of its making. C presents its main points with conflicting views on them. D cites some cases related to it and analyzes their implications.