图为某国人口自然增长率随时间变化示意图，下列说法正确的是 [ ] A．②时不会出

男性，36岁，体检发现外周血Hb98g／L，RBC3.02×10¹²／L，WBC51.2×10⁹／L，其中早幼粒细胞2％、中性中幼粒细胞15％、中性杆状核细胞24％、中性分叶核细胞39％、嗜酸性粒细胞4％、嗜碱性粒细胞7％、淋巴细胞9％，PLT432×10⁹／L，肝轻度肿大，脾明显肿大

该患者最可能的诊断（）

A.类白血病反应

B.急性早幼粒细胞白血病

C.嗜碱粒细胞白血病

D.慢性粒细胞白血病

E.骨髓增生异常综合征

A recent survey revealed that __________ dogs barking incessantly in the night that we disliked most.

A．was

B．there be

C．it was

D．there were

It was reported that the passenger ship was sailing eastwards in the Atlantic Ocean ____ its captain

and some passengers on board____ something supposed to be a UFO flying overhead.      [ ]

A. while; caught sight of                

B. when; caught sight of  

C. as; saw                            

D. since;  caught a sight of

怎样选择自吸过滤式防尘口罩？

患者，女，35岁，心悸易疲乏2年，近来有劳累性气促，检查：胸骨右缘第二肋间粗糙收缩期吹风样杂音，初步诊断为

A．二尖瓣狭窄
B．二尖瓣关闭不全
C．动脉导管未闭
D．右心心力衰竭
E．主动脉瓣狭窄