Q1. What happens when you cut a planarian into pieces?

1. AAll the pieces die.
2. BEach piece grows into a new worm.
3. COnly the head piece lives.
4. DThe pieces join together again.

each piece grows into a new worm とあるので B。

Q2. What did the worms with new heads do in one study?

1. AThey learned old lessons a little faster.
2. BThey forgot how to eat.
3. CThey could not move at all.
4. DThey grew two heads.

worms with new heads learned old lessons a little faster とあるので A。

Q3. In this passage, "check this result" means ...

1. Aforget the result
2. Bwrite the result in a diary
3. Ctest it again to see if it is true
4. Dsell the result

check は「確かめる」。結果が本当かもう一度調べる、という意味なので C。

Q1. What did Reddien's team show in 2011?

1. AA single neoblast could rebuild a whole worm.
2. BPlanarians cannot regrow their heads.
3. CNeoblasts are found only in the brain.
4. DPlanarians remember everything after cutting.

a single neoblast could rebuild all the cells of a worm とあるので A。

Q2. How long did it take for the new heads to regrow?

1. AAbout two days
2. BAbout two months
3. CAbout two hours
4. DAbout two weeks

The heads grew back in about two weeks とあるので D。

Q3. What is the writer's attitude toward the 2013 result?

1. AIt proves that memory is stored only in the tail.
2. BIt is interesting but needs to be confirmed by others.
3. CIt is completely wrong.
4. DIt shows that worms never forget.

The difference was small, and other laboratories have not fully repeated the experiment. と慎重な姿勢を示しつつ、Even so ... と興味深さも認めているので B。

Q1. What did the 2011 transplant experiment demonstrate?

1. ARadiation helps planarians grow faster.
2. BPlanarians can transfer memory by eating.
3. CA single adult stem cell can produce every cell type.
4. DHumans have the same stem cells as planarians.

That one cell produced every cell type and restored the animal's ability to regenerate. とあるので C。人間のような動物ではまれだと書かれている。

Q2. Why are the experiments from the 1950s and 1960s no longer trusted?

1. ABecause their results were subjective.
2. BBecause they used computers incorrectly.
3. CBecause the worms were too large.
4. DBecause they were never published.

Those results were subjective and are no longer trusted. とあるので A。

Q3. Which is a possible explanation mentioned by the writer for the 2013 result?

1. AThe new brain grew from old memories.
2. BNerves left in the body may have kept the information.
3. CThe worms were not really decapitated.
4. DThe worms were fed trained worms.

最終文に Nerves left in the body may also have held on to the information とあるので B。