Hotlines havebecome common in China.Some radio broadcasting stations use hot lines to encourage the listeners totake part in the talk shows. That’s a goodidea. Yet, the fact is, some people do
—Peter has good grades in all his subjects, but he never shows off.—I agree. He is very _____________.A. easy-going B. imaginative C. modest D. generous
则⊙O的半径为
（B）
（C）
（D）
