β肾上腺素受体阻滞药可
A．使支气管平滑肌收缩B．升高血压C．加快心脏传导D．促进糖原分解E．抑制胃肠道平滑肌收缩
参考答案：A
---Is he here now?---No, I ___ he ___ here by now.
A．thought, was
B．think, will be
C．think, is
D．thought, had been
一年内极端最高气温与极端最低气温之差叫气温年较差。（）
