Q1. What is the passage mainly about?

1. AHow to clean your room quickly
2. BHow messy rooms may be related to stress and creativity
3. CWhy couples argue about housework
4. DHow to buy a new house

散らかった部屋とストレス、そして創造性との関係がテーマなので B。

Q2. Who had a less healthy pattern of the stress hormone?

1. AHusbands who cleaned a lot
2. BChildren in messy rooms
3. CWives who described their homes as messy
4. DResearchers who visited the homes

Wives who used words like "messy" had a less healthy pattern とあるので C。

Q3. In this passage, "creative" means ...

1. Anew and original
2. Bvery tidy
3. Cboring
4. Ddifficult to understand

creative は「創造的な・独創的な」。new and original が最も近いので A。

Q1. What does cortisol normally do during the day?

1. AIt rises from morning to evening.
2. BIt stays the same all day.
3. CIt drops from morning to evening.
4. DIt appears only at night.

a stress hormone that normally drops from morning to evening とあるので C。

Q2. Which statement about the 2010 study is true?

1. AIt proved that clutter causes stress.
2. BThe link was not clear for husbands.
3. CIt studied only children.
4. DAll participants lived alone.

the link was not clear for husbands とあるので B。相関であり因果の証明ではない。

Q3. What does the author suggest by saying "stress makes people too busy to tidy up"?

1. ACleaning is the best way to reduce stress.
2. BBusy people never feel stress.
3. CMessy rooms are always healthy.
4. DThe cause and effect might be the other way around.

散らかり→ストレスではなく、ストレス→散らかりという逆の可能性を示しているので D。

Q1. What is the main idea of the passage?

1. AClutter may be linked to stress, but it is not simply good or bad.
2. BMessy rooms always cause serious illness.
3. CTidy rooms make people less generous.
4. DCortisol has nothing to do with stress.

ストレスとの関連を示しつつ、創造性を高める可能性もあり、目的に合わせるべきだと結論しているので A。

Q2. According to the 2011 Princeton research, why might a crowded desk be a problem?

1. AIt raises room temperature.
2. BObjects in view compete for the brain's processing power.
3. CIt makes people eat more.
4. DIt reduces cortisol in the morning.

multiple objects in the visual field compete for the brain's processing power とあるので B。

Q3. Why should the 2013 findings be viewed cautiously?

1. ABecause the rooms were too small
2. BBecause only husbands took part
3. CBecause similar findings have sometimes failed to replicate
4. DBecause apples were not available

Such priming-style findings have sometimes failed to replicate とあるので C。