答案：B
题干意思：山羊吃饱后，它们会聚集在阳光下，一边消化食物，一边晒太阳，然后继续工作。
答案解析
A、compress (V.) to press or squeeze sth together or into a smaller space; to be pressed or squeezed in this way (被)压紧，压缩
Eg. The bin can also compress the waste so it will take up less space.
垃圾桶还可以压缩垃圾，这样就会占用更少的空间
B、congregate (V.) to come together in a group 群集;聚集;集合
Eg. Young people often congregate in the main square in the evenings.年轻人傍晚时经常聚集在大广场上
c、confine (V) keep sb/sth inside the limits of a particular activity, subject,area,etc.限制;限定
Eg. He was confined to a wheelchair after the accident.经过那场事故后他就离不开轮椅了。
D、compel (V) to force sb to do sth; to make sth necessary强迫;迫使;使必须
Eg. The law can compel fathers to make regular payments for their children.这项法律可强制父亲定期支付子女的费用。
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