90%的视网膜母细胞瘤（如图）发生在（） A.1岁以前 B.2岁以前 C.3岁以前

根据下列句子及所给汉语注释，写出空缺处各单词的正确形式。(每空只写一词)

(请将答案写在答题卡上的指定位置)

66．小题1:In order to improve his oral English he spent most of his time practising ________ （发音）the words.

67．小题2:The boys were fighting, but the teacher ___________(分开) them.

68．小题3:China ________ (成功)feeds 22%of the world’s population with only 7% of the world’s land.

69．小题4:She_______(划；点燃) a match and lit the candles on the birthday cake.

70．小题5:She found she had left her wallet at home immediately she _______(登；上) the plane.

71．小题6:Don’t be too _________（挑剔）about food and clothing．

72．小题7:She often ________(描述) how she narrowly escaped the earthquake.

73．小题8:As soon as they saw the sea, the children shouted in _____________(兴奋).

74．小题9:When he _______ （摇头）his head, I knew he didn’t agree with me.

75．小题10:It is necessary for high school students to visit _________(博物馆) and broaden their views.

已实施检验检疫的出境货物，由于客观原因不能履行合同的，报检人应向检验检疫机构申请办理撤销报检手续。()

阅读提供的资料，你能谈谈自己的看法吗？  

资料一   内蒙古草原由于过度放牧，草原植被破坏严重，是造成近年来北京几次沙尘暴的主要原因。我国现投入大量资金在内蒙古建立一条约300万平方米的绿化带，预计总投入的资金是当年放牧得利的1000倍。  

资料二   世界环境日的主题，曾连续三年提出“没有破坏的发展”的口号。  

资料三   华北某县以前锄草种小麦，农民的收入一般；现在锄小麦种草，农民都发了财。  

资料四   我国北方的沙尘暴问题也困扰着韩国，他们提出无条件到我国内蒙古一带进行绿化。

平均存货水平与以下因素有关的是（）。

A.原材料的多少

B.生产量

C.库存量

D.顾客需求量大小