A The results were what he had predicted.
B The experiment was simple to set up.
C A large sample of people was tested.
D The subjects were unaware of what they were drinking.
E The test was repeated several times for each person.
A She used the wrong sort of nuts.
B She used an unsuitable chemical.
C She did not grind the nuts finely enough.
D The information on the nut package was incorrect.
E The weighing scales may have been unsuitable.
Choose the correct letter, A, B or C.
28 Adam refers to the location and width of stairs in a train station to illustrate
A practical changes that can influence people’s behaviour.
B methods of helping people who have mobility problems.
C ways of preventing accidents by controlling crowd movement.
29 What do the students agree about including reference to exercise in their presentation?
A They should probably leave it out.
B They need to do more research on it.
C They should discuss this with their tutor.