小明用显微镜观察材料时，发现视野中有一污物存在。于是，他移动玻片标本，污物不动；换用洁净的目镜后，污物仍然存在。据此判断污物最有可能在(    )

某一广告墙PQ旁有两根直立的木杆AB和CD，某一时刻在太阳光下，木杆CD的影子刚好不落在广告墙PQ上，

（1）你在图中画出此时的太阳光线CE及木杆AB的影子BF；

（2）若AB=6米，CB=3米，CD到PQ的距离DQ的长为4米，求此时木杆AB的影长．

根据句意，用括号内所给单词的正确形式填空。（一空一词）

1.They are organizing the____  (thirty-nine) sports meeting of their school.

2.The house____ (it) is very beautiful, but the river near it is much polluted.

3.The boy's dad was ____ (complete ) shocked when he saw that his son was playing with fire.

4.The news and talk shows may not be very exciting, but we can expect ____  (learn) a lot from them.

5.My grandfather's sunny character has a great ____ (influent) on me in my life.

①人民生活安定

②促进经济社会持续健康发展

③有利于世界金融稳定、经济发展

④保持国内物价稳定不变