在风和日丽的情况下，植物叶片在早、中、晚的水势变化趋势一般是____。
A．低，高，低
B．高，低，高
C．低，低，高
D．高，高，低
参考答案：B
术后1周，病人出现持续性高热，右肋缘下疼痛伴呃逆，白细胞24×10/L，胸片右侧中量胸腔积液，最可能的是（）
A.肺部感染
B.切口感染
C.膈下脓肿
D.盆腔脓肿
E.纵隔脓肿
. -- Jack _______ for work in the downtown. What was the matter?
-- _______, but he had no luck.
A．ought to have hunted; So he was
B．ought to have hunted; So he did
C．ought to hunt; So he has
D．ought to hunt; So he did
