阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空（每空不超过三个单词）。 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-mole requires people to hit one of nine {#blank#}1{#/blank#} (button). 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 （准确度）. The study invited 40 men and {#blank#}2{#/blank#} (woman) aged 19 to 59. Some of them had sons or daughters, although none of {#blank#}3{#/blank#} (they) children were babies. They played whack-a-mole after listening to different sounds, {#blank#}4{#/blank#} (include) the babies' crying, the crying of adults in trouble and bird songs {#blank#}5{#/blank#} (play) at a similar pitch （高音）to the babies' crying.
The volunteers' scores were {#blank#}6{#/blank#} (high) 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 {#blank#}7{#/blank#} (possible) to ignore （忽视） crying babies {#blank#}8{#/blank#} planes. This is true even though there are so many other noises around," said Morten Kringel bach, the scientist {#blank#}9{#/blank#} led the study. He added that in the course of human evolution （进化） taking care of babies has always been {#blank#}10{#/blank#} 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.
