单项选择题
A.#div1{color:#00f} B..div1{color:#f00} C.div{color:#00f} D..div1{color:#00f}
A.border-radius:20px40px60px; B.border-radius:20px60px40px; C.border-radius:20px60px40px40px; D.border-radius:20px40px60px40px;
A.ul B.dl C.ol D.section