题目

下列能说明生物能对外界刺激作出反应的是（    ）    A.人排尿                             B.鲸呼气时会产生雾状水柱    C.西瓜能进行光合作用制造有机物       D.含羞草的叶受到触碰时会合拢 答案：DI’m looking forward to _________ Beijing.This summer holiday my family are going to_____ the Oympic Sports Center.A.visit , visitingB.visiting, visitC.visit , visitD.visiting, vsiting