None of the five centenarians have any children.A

Do the results of the experiment have any practical（) in agriculture？A advantageB applic

Five years have passed but the consequence of the research is still in doubt.A.outcomeB.j

" That" in the first sentence of Paragraph Five refers to______.A．any of Diana"s brilliant

I have two brothers.______in the army.A．None of them isB．Neither of them isC．None of them

Passage Five Memory is the ability to keep track of things that have happened in the past

The five centenarians live in a very friendly com