—About 20 minutes．

A．How long

B．How often

C．How far

D．How many times

A. he B. his C. he’s D. him

A.taller B.the tallest C.tallest D.the taller

A. remind, of B. reminds, of

C. to remind, with D. reminded, with

We’re hearing a lot these days about something called AI, or artificial intelligence. Put simply, AI is intelligence that is displayed by machines. In the beginning of computer technology, machines were 【1】 quite stupid. They could only do what people told them to do, and computers didn’t have the 【2】 to do anything complex. Slowly, that began to change. In 1989, two AI programs, Hi Tech and Deep Thought, showed advanced problem-solving skills after they 【3】 human masters in the game of chess. It was then that people began to see the true potential(潛能) of AI.

Today, AI can be used at work in our factories, online, and in our daily lives. Siri, the iPhone’s digital assistant, is a good example. Users can say almost anything to Siri and get a surprisingly humanlike 【4】.

—How far is it from your home to school？

—It’s about twenty________walk．

A．minute’s

B．minutes’

C．minutes

A. present B. are presented

C. were presented D. presented

A. don’t they B. do they

C. haven’t they D. have they

— He is my teacher Mr. Wang.

A.Where

B. Who

C.What

D.What about

A.taller B.the tallest C.tallest D.the taller