When a baby cries, its parents will check on it as soon as they can and make sure it is okay. According to a new study, a baby's cry can make adults react very quickly, even if they are not related to the baby.

Oxford University researchers used the classic game whack-a-mole（打地鼠）for the study. Whack-a-hole requires people to hit one of nine buttons（按鈕）. Players must react as quickly as they can to whichever of the buttons that lights up. It is a game that requires speed and accuracy（準(zhǔn)確度）.

The study invited 40 men and women aged 19 to 59. Some of them had sons or daughters, although none of their children were babies. They played whack a-mole after listening to different sounds, including babies crying, the crying of adults in trouble and birdsongs played at a similar pitch（高音）to the babies' cries.

The volunteers' scores were higher after listening to the sound of crying babies. Men and women had similar scores overall. The results showed that hearing a crying baby can trigger a reaction in adults.

"It's almost impossible to pay no attention to crying babies on planes. This is true even though there are so many other noises around." said Morten Kringelbach, the scientist who led the study. He added that in the course of human evolution（進(jìn)化）, taking care of babies has always been an important job for adults. When a baby is hungry, it will cry. As a result, human brains develop a special reaction to a baby's cry.

1.According to the story,___________ can make adults react very quickly.

A.birdsongs t B.babies' cries C.babies' laughter D.the crying of adults

2.The game "whack-a-mole" in the study shows ____________________.

A.men and women have different reaction speeds

B.women react to a baby's cry more quickly than men

C.a baby's cry can get special attention from adults

D.adults without babies react less quickly to babies crying

3.What does the underlined "trigger" in Paragraph 4 probably mean?

A.End. B.Cut. C.Push. D.Cause.

4.What do we know from the story?

A.It's hard for people not to notice babies' cries.

B.There were 59 volunteers who took part in the study.

C.Human brains have developed to take. care of babies.

D.Taking care of babies is the most important thing for adults.

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