在一个由植物→雷鸟→猛禽组成的食物链中,若捕捉了全部猛禽,雷鸟的数量会( )
A.缓慢上升
B.迅速上升
C.仍保持相对稳定
D.先迅速上升后急剧下降
答案:D
Only when he reached the teahouse ______ it was the same place he'd been in last year. [ ]
A. he realized
B. he did realize
C. realized he
D. did he realize
男,63岁,高血压病10年,血压一直维持在130~140/85~95mmHg。近1年来尿蛋白+,发现糖耐量异常。降压药物的最佳选择是()
A.利尿剂
B.钙通道阻滞剂
C.β-受体阻滞剂
D.转换酶抑制剂
E.血管扩张剂