题目内容：

The scent of coffee appears to enhance performance in math

Drinking coffee has benefits. ______ the physical improvement, coffee may reduce our risk of heart disease. Coffee may even help us live longer. Now, research also reveals that the scent（气味）of coffee may help people perform better on the analytical portion of the Graduate Management Aptitude Test, or GMAT, a computer adaptive test ______ by many business schools.

The work, led by famous professor Adriana Madzharov, not only ______ the hidden force of scent and the cognitive（认知）improvement it may provide on analytical tasks, but also expectation that students will perform better on those tasks. Madzharov, with his colleagues, recently published their findings.

“It’s not just that the coffee-like scent helped people perform better on analytical tasks, which was already ______,” says Madzharov. “But they also thought they would do better, and we demonstraded that this expectation was at least partly ______ their improved performance.” ________, smelling a coffee - like scent, which has no caffeine in it, has an effect similar to that of drinking coffee, suggesting a placebo（安慰剂）effect of coffee scent.

Madzharov’s team tested 100 undergraduate business students, divided into two groups, with GMAT algebra questions. One group took the test in the ______ of a coffee - like scent, while a control group took the same test - but in an unscented room. They found that the group in the coffee-smelling room scored significantly higher on the test.

Madzharov’s team wanted to know more. Could the first group’s performance in quick thinking be explained, in part, by an expectation that a coffee scent would increase ______ and consequently improve performance?

The team designed a follow-up survey, conducted among more than 200 new participants, quizzing them on ______ about various scents and their effects on human performance. Participants believed that they would feel more alert and energetic in the presence of a coffee scent, in contrast with a flower scent or no scent; and that ______ to coffee scent would increase their performance on mental tasks. The results suggest that ______ about performance can be explained by beliefs that coffee scent alone makes people more alert and energetic.

Madzharov is now looking to explore whether coffee-like scents can have a(n) ______ placebo effect on other types of performance, such as verbal reasoning. She also says that the finding - that coffee - like scent acts as a placebo for analytical reasoning performance - has many practical ______, including several for business.

“Sense of smelling is one of our most powerful senses,” says Madzharov. “Employers, architects, building developers, retail space managers and others, can use scents to help ______ employees’ or occupants’ experience with their environment. It’s an area of great interest and ______.”

1.A.In contrast to B.Contrary to C.In addition to D.Equivalent to

2.A.acquired B.required C.justified D.inquired

3.A.distributes B.stimulates C.dominates D.highlights

4.A.encouraging B.imposing C.conflicting D.challenging

5.A.characterized by B.called for C.responsible for D.typical of

6.A.In short B.By comparison C.In particular D.After all

7.A.lack B., shift C.withdrawal D.presence

8.A.comprehension B.alertness C.conscience D.context

9.A.evidence B.definition C.symptom D.belief

10.A.adaptation B.commitment C.exposure D.alternative

11.A.implication B.expectation C.indication D.illustration

12.A.similar B.concrete C.modified D.estimated

13.A.simplification B.description C.resignation D.application

14.A.enhance B.evaluate C.exploit D.prospect

15.A.negotiation B.priority C.potential D.strategy