确诊二尖瓣狭窄最可靠的辅助检查方法是A．心导管检查 B．心电图检查 C．超声心动图检

短文改错。

Before he was a teacher, Bob told me that what he would like to do a lawyer when he was at school.

He had worked very hard at his lessons and try to enter into a famous university, but something unhappy

happened to his family, which made necessary for him to work for a life. As a young man, he had been a

bus-driver, a dust-man , a salesman. But he spent his spare times studying and finally became a college

teacher. "Young people," he often said, "full of wishes and hopes after they step into society."

如图为“气温年较差随纬度变化曲线图”．读图完成17～18题。

小题1:关于气温年较差的分布规律表述正确的是

A．赤道地区气温年较差最小，两极地区最大

B．南北纬60°附近气温年较差均较大

C．赤道地区最小，随纬度的增加，气温年较差不断增大

D．北半球中低纬度地区气温年较差与纬度呈正相关小题2:60°N附近气温年较差超过40℃，主要影响因素是

A．纬度较高，陆地面积广阔

B．深居内陆，大陆性强

C．地势较高，温差大

D．冬季有寒流通过，夏季有暖流通过

下面哪种说法是正确的，医疗机构可根据病人需要，酌情使用（）。

A.全血、原料血浆

B.成分血、脐带血

C.全血、成分血

D.成分血、原料血浆

出现瘀血证时，面部颜色可见（）

A.青色、赤色

B.黑色、青色

C.黄色、黑色

D.赤色、白色

E.赤色、黑色

花卉雕刻作品的种类很多，如菊花、月季、玉兰、梅花等，既可用于单独装饰菜肴，也可以组装成花篮置于餐桌中心，烘托宴会气氛，突出宴会主题。