Not until my British friend came to China（）how densely populated the country is.
A. did he realize
B. he didn't realize
C. he realized
D. he could realize
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彩色血流图是指
A. 振幅调制型
B. 辉度调制型
C. 彩色血流显像
D. 多普勒频谱显示
E. 活动显示型
One important aspect the old should learn from the young is that ______.
A. they should fully enjoy life and reject worries
B. they should expect a better future and cherish the hard past time
C. they should try to integrate leisure in work
D. they should learn to indulge in material life
消化道穿孔的临床表现哪项是错误的
A. 突然剧烈腹痛，呕吐
B. 必有胃十二指肠溃疡病史
C. 板样腹，压痛反跳痛肌紧张
D. 肠鸣音消失
E. 大多数病人立位X线检查可见膈下游离气体
我国现阶段的中外合资企业、中外合作企业的本质是( )。
A. 混合性质的经济
B. 资本主义性质的经济
C. 社会主义性质的经济
D. 社会主义条件下的国家资本主义性质的经济
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