15. They used to argue all the time and now they've _________ stopped talking to each other.
(A) practically
(B) approximately
(C) monumentally
(D) superficiallyII. ClozeBonobos are our lesser-known cousin in the animal kingdom. Along with chimpanzees,they are our closest living relatives. They share many similarities with chimps and were onceconsidered the same species, known as the "pygmy chimpanzee".We now know this is far from the case. 16 chimpanzees tend to be more aggressiveand manipulative, bonobos are much more gentle. In fact they are so gentle they often expresstheir 17 towards many members of the group with sex, the so-called bonobo handshake.Other than the above-mentioned, in the latest insights, published in the American Journalof Primatology, researchers 18 into the behavior of a group of 16 wild bonobos from theLuo Scientific Reserve in the Democratic Republic of Congo.The findings of a detailed personality test on bonobos show that female bonobos are afeisty bunch. They have dominant, high-status roles within bonobo society, in stark contrast tothe more 19 role that females play in chimpanzee groups. It might therefore not surpriseyou to find that female bonobos show 20 levels of irritability than male bonobos, who inturn are more introverted.