荧光A．引入助色团以及溶剂改变使吸收峰向长波方向移动B．芳香族化合物的特征吸收带C．

He had to         so that others could hear him be cause it was too noisy in the room.  [ ]

A .sing    

B. cry    

C. shout  

D. laugh

X线胸片双肺透明度增加，提示

A．肺炎
B．肺结核
C．肺水肿
D．肺部肿瘤
E．肺气肿

The explorer told the boys about his ______ in the African forests.

A．stories

B．voyage

C．adventures

D．trips

制定身高标准体重时，是以同等身高的体重______为标准体重

A．p60
B．p70
C．p80
D．p90
E．p100

痰的致病特点之一是（）

A．头晕目眩

B．随气流窜

C．积于管腔

D．肢体困重