物质的量浓度相同的下列物质的水溶液，酸性最强的是

A．HCl

B．H₂SO₄

C．CH₃COOH

D．NaCl

By "a chance for a fresh start" the author means ______

A．one should learn to seize chances

B．one should often change his jobs

C．unemployment can be of benefit

D．unemployment does not last long