单选题
阅读下面短文，从短文后所给的[A] 、[B] 、[C] 三个选项中选出能填入相应空白处的最佳选项。
If you are writing or studying, it makes very much difference where the light comes from. People who use books and pens every day{{U}} (41) {{/U}}to be especially careful about the direction from which the light shines on their work.
A house gets it's light{{U}} (42) {{/U}}from daylight through windows{{U}} (43) {{/U}}is very good to use or from the lamps, but no matter what kind of light it is, the direction it slants(倾斜) towards our books or our work is a matter of great{{U}} (44) {{/U}}to the eyes.
Take a book, stand with your back toward the window, and try to read. Your shadow falls across the page and makes it bad for your eyes as if you were in a{{U}} (45) {{/U}}room.
Now turn{{U}} (46) {{/U}}and face the window. The page is the shadow again, while the bright light is in your{{U}} (47) {{/U}}. Try standing with your right side towards the window. This is very good for reading,{{U}} (48) {{/U}}if you were writing, the shadow would{{U}} (49) {{/U}}the page and trouble you a little.
There is just one other way: stand with your{{U}} (50) {{/U}}side to the window. Now everything is perfect for reading and for writing, too.
【正确答案】 B
【答案解析】考查动词用法。want想要；know知道have to必须。填入[A]、[C] 两项语法虽正确，但意思不合逻辑．have to实际上是一个情态动词，用在此处含有警告或者忠告的意味。
【正确答案】 A
【答案解析】考查连词固定搭配。由空格后与此处并列的or from...部分即可推知应选either，构成either ...or...这一固定搭配，指“要么…，要么…”。
【正确答案】 C
【答案解析】考查从句连接词。由句子结构可知空格后是一个从句，修饰daylight(日光)。而先行词是事物，且连接词在从句中不充当句子成分，因此应用which。
【正确答案】 C
【答案解析】考查名词辨义与上下文理解。由句意及空格前的修饰语great可知应选importance(重要，重要性)。(be)of great importance to指“对…来说很重要”。
【正确答案】 A
【答案解析】考查形容词辨义与上下文理解。dark黑暗的，bright明亮的；small小的。由句意、句中的 shadow(阴影)、bad(不好的)及as if后所用的虚拟语气不难推知选[A] 。
【正确答案】 B
【答案解析】考查固定搭配。turn over翻转，打翻；turn around转身，转过来；turn off关上(电器等)。由句意可知这里是要读者转过身来脸朝窗户，因此选[B] 。
【正确答案】 A
【答案解析】考查名词与上下文理解。eye眼睛；face脸,back背(部)。由上下文与常识可知，脸朝窗户时，光线会照着眼睛、影响阅读，故选[A] 。
【正确答案】 A
【答案解析】考查上下文关系。由句意可知，空格前后是明显的对立关系，因此选表转折的but(然而，但是)。or表选择和让步，指“或者，否则”；so表示因果，指“因此”。
【正确答案】 C
【答案解析】考查固定搭配。fall down落下，掉下；fall into落入，陷入；fall across(阴影等)投射在…上。在前文中已经出现过fall across这一搭配，考生应能很快确定答案。
【正确答案】 B
【答案解析】考查上下文理解。由于前面提到的是将右边(your right side)朝向窗户，并且分析的是这样做的坏处，这里肯定就是说将左边朝向窗户了，因此选与right对立的left。