题目

  钒被誉为“合金中的维生素”。钒元素的部分信息如 “题15图”。请回答下列问题： （1）钒原子的质子数为__ _______ _，x=___________。 （2）钒属于__ _______ （填“金属”或“非金属”）元素； 钒的相对原子质量为__ _______ ____。                    题15图 答案：（1）23    2   （2）金属    50.94用方框中所给动词短语的适当形式填空compared with ,catch up with, protect…from, at once, have to1.If anything happens to him, let the doctor know________.2.___________ my father’s handwriting, mine is poor.3.My mother is ill. I______________ stay at home.4.Danny saw Jenny walking on the sidewalk in front of him. He ran to __________her.5.The volunteers make great efforts to ________the animals______ going extinct.