若一个相对封闭的生态系统中共有五个种群,其能量调查如下表所示:①~④图是根据该表数据作出的一些分析,其中最可能错误的是
A.①③
B.②
C.②④
D.①③④
答案:A
— Be seated, please and I'll make you a cup of tea.
— _________. Let's come to the point first. [ ]
A. You needn't do so
B. Please don't bother
C. You are welcome
D. You are indeed too polite.
诊断急性阑尾炎最有意义的体征是:
A.体温升高
B.右下腹固定而明显压痛
C.腹部气胀
D.肠鸣音减弱或不规律
E.阑尾穴压痛试验阳性