Why does the writer use the example of the aeroplane?
A.To explain why transport changed in the 20th century.
B.Because he thinks It's the most important invention in history.
C.To explain how space travel started.
D.To show how an invention developed quickly.

What does the writer say about the future of communication?
A.We can't know what the most popular social media will be.
B.Microchips will become faster.
C.We won't use the internet as much.
D.We won't need devices like smartphones.

What does the writer say about space solar power?
A.It's an old idea, but people are only starting to develop it now.
B.It's a science fiction idea, and nobody really thinks it will work.
C.It's much easier to build a solar power station in space than on Earth.
D.People tried it in 1941, but they didn't succeed.

What are industrial robots like?
A.They behave like humans.
B.They controlled machinery.
C.They look like humans.
D.They are computer-controlled machines.

The passage is mainly concerned with .
A.bony flatfish
B.evolution asymmetrical
C.symmetrical flatfish
D.different types of flatfish

The author mentions skates and rays as examples of fish that .
A.have spread horizontally
B.become asymmetrical
C.resemble sharks
D.appear to fly

According to the passage, the ability of a bony flatfish to move its eyes around is .
A.average
B.excellent
C.weak
D.variable

According to information in the passage, which of the following is LEAST likely to occur as a result of animals' intuitive awareness of quantities?
A.A pigeon is more attracted by a box containing two pieces of food than by a box containing one piece.
B.A lion follows one antelope instead of the herd of antelopes because it is easier to hunt a single prey.
C.When asked by its trainer how old it is, a monkey holds up five fingers.
D.When one of its four kittens crawls away, a mother cat misses it and searches for the missing kitten

What is the passage mainly about?
A.A new kind of currency in the virtual world
B.A way of doing business in the virtual world
C.An alternative to bitcoins created by Nakamoto
D.The future of bitcoins in the real world

The word “minuscule” is closest in meaning to .
A.considerable
B.small
C.minimal
D.increasing