1. Xiao Wang designed a table of A4 size in a Word document. According to the requirements, 1000 tables of this size need to be designed. Xiao Wang wants to use the "copy - paste" method (select the table with the mouse, right-click to "copy", and then "paste" in the same Word document) to meet the requirement. How many times does Xiao Wang need to use "copy - paste" at least?
A: 9 times
B: 10 times
C: 11 times
D: 12 times
Answer $\mathrm{B}$.
Analysis Let the number of times "copy - paste" is needed be at least $n$, then according to the problem, the 1st time can "copy - paste" 1 sheet, the 2nd time "copy - paste" 2 sheets (including the original sheet), the 3rd time "copy - paste" 4 sheets, ..., the $n$th time "copy - paste" $2^{n-1}$ sheets, so
$$
1+1+2+2^{2}+\cdots+2^{n-1} \geq 1000 \Rightarrow 2^{n} \geq 1000
$$

Therefore, $n \geq 10$, hence, the number of times to "copy - paste" is at least 10.