As any plane passenger will confirm, a crying baby is almost impossible to ignore, no matter how hard you try. Now scientists believe they may have worked out why. A baby’s cry pulls at the heartstrings(扣人心弦) in a way while other cries don’t, researchers found. Researchers found that a baby’s cry can trigger unique emotional responses in the brain, making it impossible for us to ignore them-whether we are parents or not. Other types of cries, including calls of animals in great pain, fail to get the same response, suggesting the brain is programmed to respond specifically to a baby’s cry. (1)、Why is it hard to ignore a baby’s cry? (2)、What does the underlined word “trigger” in paragraph 2 probably mean? (3)、What may Christine Parsons agree with? (4)、What does the passage mainly talk about?
选项：

A:team
B:It
C:It
D:It
E:It
F:cause. G:remove. H:avoid.