涡静脉有（）条，分布在眼球（），以（）方向穿过巩膜。
参考答案：4-6；赤道后上下直肌两侧；倾斜
34．About seven years ago she felt she had to ask herself____she really wanted to spend her life farming. Now she has make up her mind to quit farming.
A．when
B．whether
C．what
D．where
研究网站链接结构的目的在于用（）使得浏览最有效率。
