Appendix: Answer KeysAppendix: Answer KeysSection 5 of 9

b.5Section 3 practice: city trees

Matching headings

Q	Para	Key	Why
30	B	vi	The change is driven by measurements and above all by temperature, then two cooling mechanisms are given.
31	C	ii	Health evidence is given, then immediately qualified: wealth and greenery are hard to separate.
32	D	iv	Entirely about rainfall, interception and drainage.
33	E	vii	Confined roots, compacted soil, salt, pollution, and a high death rate within five years.
34	F	i	Successful programmes changed what they count: canopy in ten years instead of trees planted.

Headings iii, v and viii are unused. Heading iii describes paragraph A, which was not a question. Headings v and viii describe ideas that never appear in the passage, which is how the examiner tempts students who match single words rather than whole paragraphs.

True, False, Not Given

Q	Key	Why, and the common mistake
35	TRUE	Fell by more than a third between 1950 and 1990. A third is more than thirty per cent.
36	FALSE	Two mechanisms are given: blocking sunlight and evaporation. The word only makes the statement false.
37	FALSE	Researchers are careful, and separating wealth from greenery is described as difficult. Confident is the opposite.
38	NOT GIVEN	A large proportion die is not the same as most die, and cannot tell us whether most survive. The hardest question in the set.
39	FALSE	Planting is a fraction of the cost of keeping the tree alive, so planting costs less.
40	TRUE	A single species left streets vulnerable to a single disease.