题目内容
20．If I _____ a bird，I would fly to every part of the world．（ ）| A． | am | B． | is | C． | was | D． | were |
分析 如果我是一只鸟，我会飞到世界的每一个角落．
解答 答案：D．考查系动词．句意"如果我是一只鸟，我会飞到世界的每一个角落．"．A通常与I连用．B单数．C过去式，单数．D过去式，复数．这里表示的是跟现在事实不符的情况，是不可能实现的事情，因此这里应该用虚拟语气．在if从句中用一般过去时，主句中用would+动词的原形．be动词用过去式were．答案是D．
点评 考查系动词，is是单数，are是复数，am通常与I连用，要结合语境，选择合适用法，注意人称及主语的单复数变化．
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8．Your eyes allow you to see color，light，buildings and the faces of those you love．The eyes are a clear way to feel the world．Here are some tips about how to look after your eyes．
Take an eye break
（106）FThat puts a lot of pressure on their eyes．So for every 20minutes spent looking at a screen，you should take an eye break of around 20seconds．（107）D
Wear a sun hat or sunglasses
There are some harmful rays （有害光线） from the sun．UV rays can be harmful to eyes，so it's best to get in the habit of protecting （保护） them from an early age．（108）A
Eat eye-friendly foods
You can also protect your eyes by eating some eye-friendly foods．（109）B
Have a good sleep
Make sure you have a good night's sleep．（110）E But it's the time for your body to rebuild and repair （重建和修复）．At night，your eyes keep cleaning out the dirty things which come in during the day．
Take an eye break
（106）FThat puts a lot of pressure on their eyes．So for every 20minutes spent looking at a screen，you should take an eye break of around 20seconds．（107）D
Wear a sun hat or sunglasses
There are some harmful rays （有害光线） from the sun．UV rays can be harmful to eyes，so it's best to get in the habit of protecting （保护） them from an early age．（108）A
Eat eye-friendly foods
You can also protect your eyes by eating some eye-friendly foods．（109）B
Have a good sleep
Make sure you have a good night's sleep．（110）E But it's the time for your body to rebuild and repair （重建和修复）．At night，your eyes keep cleaning out the dirty things which come in during the day．
| A．Wearing a sun hat or sunglasses is the best way to protect your eyes． B．Green vegetables and fish can reduce （减少） the risk of eye problems． C．Drink more warm water can also help a lot． D．During the break，you should look at something that is at least 6meters away． E．You may think you are doing nothing when you're sleeping． F．Many people need to look at computer screens when they work or study． |