It's a ________ to get ready to help the people in need.
A:chance
B:shame
C:pleasure
D:pity
Martin looks so well. We've never seen him ______ so well before.
表丙:不同浓度的油菜素内酯水溶液对芹菜幼苗生长影响的实验结果(a~e依次增大)
组别
清水
浓度a
浓度b
浓度c
浓度d
浓度e
平均株高/cm
16
20
38
51
42
24
某种零件,标明要求是φ20±0.02 mm(φ表示直径,单位:毫米),经检查,一个零件的直径是19.9 mm,该零件____ (填“合格”或“不合格”).
下列人物中,极力宣传“观大地诸国,皆以变法而强,守旧而亡”观点,推动维新变法的是( )