Test

In the first paragraph the writer says that the nano-spider

• Is much thicker than a human hair

• Cannot be seen under a microscope

• Was invented by an individual scientist

• Is an extremely small machine

Answer explanation

microscopic robot . . . device)

Why does the writer suggest nano-spiders can be classified as robots?

• because they have the features of a robot

• because they can walk

• because they are built with computer chips

• because they are microscopic devices

Answer explanation

understand its surrounding environment, make decisions and move automatically

What does 'this' refer to in .I 30?

• the number of steps DNA walkers can manage

• the walking distance a DNA walker can do

• the length of the DNA walkers

• the time each step takes for a DNA walker

Answer explanation

possible walking distance of around 100 nanometres

What do we learn about nano-spiders in the fifth paragraph?

• They could protect our bodies from disease ni future.

• They are already being used to fight cancer.

• They have been used for various medical purposes in the past.

• They have not actually been invented yet.

Answer explanation

One day, people could live . . . with miniature robot surgeons . . . protecting the insides of their bodies.

What does the writer say about arguments against the use of

nanotechnology?

• People are concerned that it is used to build computer parts.

• People are concerned that nano-products are not tested

  before they are sold.

• There are concerns about whether the industry has strict

  rules for safety.

• There are no concerns about nanotechnology in medicine.

Answer explanation

most of these concerns are over safety

regulations . . . would like further tests to be carried out on products before they are allowed to enter the market

Al in all, the writer presents nanobotsas devices which

• we should be afraid of.

• have already been in use for many years.

• may be very useful in the future.

• are mainly useful in industry.

Answer explanation

(these microscopic robots will a l l o w treatments to be given that are currently impossible)