He climbed silently＿＿＿＿＿＿seizing the thief＿＿＿＿＿＿.

A．in the purpose； by surprise

B．with purpose of； surprisingly

C．with purpose of； surprisedly

D．with the purpose of； by surprise

有四组不同的电阻．已知R₁＜R₂，那么电阻值最小的是（　　）

A．R₁、R₂并联

B．R₁、R₂串联

C．只有R₁

D．只有 R₂