Chimpanzees (黑猩猩) enjoy watching movies together, scientists have discovered, in research that suggests social bonding through shared experience has deep evolutionary roots.

It is widely known that humans can bond over group activities such as watching a movie or playing board games. But it has been unclear whether the underlying psychology behind this effect is present in other species.

In the research, chimpanzees were placed in pairs and shown a short video. The researchers then measured how long it took them to approach their partners, how close they got and how long they remained in proximity (靠近) — two measures of social bonding.

Chimpanzees who had viewed the video with either another of their own species or a human approached their partner faster or spent longer in proximity to them, compared with those who had watched the video on their own, the scientists found.

The finding indicates that social bonding created by shared experience may have deeper evolutionary roots than previously thought.

“Animals can stand together and watch a waterfall, but they don’t seem to seek out those kinds of experiences,” said Wolf, an author on the study. “So for a long time we thought they weren’t capable of processing that way or they weren’t feeling any psychological consequences from doing so.”

“It’s exciting that at least some parts of the psychology that we need to connect through shared experiences may actually have a slightly older evolutionary history than previously suspected.”

The animals were tracked for only three minutes after they had watched the film, so it is not clear whether shared experiences strengthen social bonds in the long term. The research used animals in captivity (圈养), and scientists said it was not known whether the same effects would be observed in the wild.

【小题1】What does the underlined part in Paragraph 2 mean?

A．Experiencing social bonds.	B．Sharing evolutionary roots.
C．Humans bonding over group activities.	D．Chimpanzees watching movies together.

【小题2】How did the researchers get the findings?

A．By making a comparison.	B．By introducing a concept.
C．By using an expert’s words.	D．By referring to another study.

【小题3】What did Wolf think of the research findings?

A．Imperfect.

B．Encouraging.

C．Groundless.

D．Doubtful.

【小题4】What does the last paragraph mainly talk about?

A．Approaches to future studies.	B．New evidences of other researches.
C．The aspects which may need further tests.	D．The application of the research findings.