单项选择题
Pure feldspar is a colorless, transparent mineral, but impurities commonly make it opaque and colorful().
A.truly B. rapidly C. periodically D. frequently
单项选择题 You don't need to carry large amounts of cash; actually all financial businesses will be conducted by computers.()
单项选择题 “What do you mean by that”Paul asked sharply()
单项选择题 Our lives are intimately bound up with theirs.()
