题目内容

——Where’s Zhang Ying?——He’s gone to his teacher for _____about his homework.

A. advice
B. the advice
C. an advice
D. advices

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There are many ____ in my little brother's box.

A. mouses
B. leafs
C. sands
D. toys

____do they have?

A. How much cattle
B. How many cattle
C. How many heads of cattle
D. How many cattles

在迈克尔逊干涉仪的一支光路中，放入一片折射率为n的透明薄膜后，测出两束光的光程差的改变量为一个波长，则薄膜的厚度是（）

A. λ/2
B. λ/(2n)
C. λ/n
D. λ/2(n-1)

对2～3岁幼儿进行定期体格检查的时间为

A. 每月1次
B. 每2个月1次
C. 每季度1次
D. 每半年1次