阅读短文, 选择答案。

     I am a number (数字).  I have (有) four letters (字母).  My first (第一) letter is in "four" ,but not in

"your".  My second (第二) letter is in "in", but not in "on".  My third  (第三) letter is in “vest", but not in

"test". The last letter is between "d" and "f".  Who am I? 

1. How many letters does the number have (有)?         

A. 5        

B. 3        

C. 4

2. The first letter is           .          

A. f        

B. o        

C. y

3. The third letter is           .         

A. e        

B. s        

C. v

4. The number is           .         

A. four      

B. five      

C. ten