The zoo worker told the visitors that in the case of a highly ________ animal, performance training iseasy and not so painstaking.[ ]

下列词语中加点字的读音全都正确的一组是

It is surprising that such a young boy can swim ______ the river ______ 100 meters wide.

25, when the number of consumers worldwide has reached 4.2 billion, people with high income will be, for the first time, more than _______struggling to meet basic needs.

is no perfect person, some peoplehave made _____success of themselves in spite of what would appear to be ______weakness in their professions