根据题意，选择最佳答案，或者选取最合适的答案。

1. --These books are both interesting and instructive. --No wonder they __________ the youth.
   appeal to attend to
解析：解析试题分析：考查动词短语辨析。A向……投诉，呼吁，对……有吸引力；B处理，注意，照顾。这里指这些书籍对年轻人很有吸引力，故选A。
2. If we don’t study hard, we will in our class.
   take the lead fall behind
解析：解析试题分析：句意：如果不努力学习，我们将会在班上落后。经去伦敦了。A. take the lead带头，为首；B. fall behind 落后；根据句意可知选B。
3. Eating too much fat can ______ heart disease and cause high blood pressure.
   prepare for contribute to
解析：解析试题分析：考查动词短语辨析。A 由于…的原因；B致力于：C照顾；D导致，做贡献；句意：吃太多的脂肪可能导致心脏病并导致高血压。根据句意说明D正确。
4. ---Hey, Ben. Why didn’t you go to Eric’s birthday party? ---I had to the final-term exams.
   prepare for write down:
解析：解析试题分析: 句意：---Hi，Ben，为什么你没有去参加Eric的生日聚会？---我不得不为期末考试做准备。A为……做准备；B写下；此题考查固定短语，根据句意，故选A
5. My father is able to _______many different kinds of computers.
   fix up clean up
解析：解析试题分析：句意：我的父亲能组装许多不同种类的电脑。分析选项：；fix up 组装；clean up清理。联系句意为组装之意，用fix up.故选A
6. Amy would rather __________. Let’s take her to the KFC restaurant.
   Western food than Chinese food have Western food than Chinese food
解析：解析试题分析：句意：Amy宁肯吃西餐也不吃中餐，让我们带她去肯德基参观吧。本题考查would rather do than….表示宁肯……也不…….。结合句意，故选B
7. Some famous singers live on the________from their record sales.
   bill income
解析：解析bill账单，清单，显然不符合题意；income“收入，收益”，通常指一个人收入所得的钱，不仅只是工资部分。结合上下文，应该选B
8. Mike failed the math test again. It made his father _____.
   happy angry
解析：解析试题分析：句意：马克数学考试又没有及格。这使他的父亲生气。happy高兴的，是形容词； angry生气的，是形容词；make sb +形容词“使某人处于某种状态”，故此处用形容词。根据Mike failed the math test again.可知马克考试不及格，他父亲生气了，故选B。
9. I'm afraid you have no _____ but to come along with us.
   choice selection
解析：解析 句意为我怕你没有机会和我们一起去。 choice，侧重主观的选择；selection，强调受客观条件影响下做出的选择
10. From this simple concept ________ that has caused a great change in farming
    has developed a technique has a technique developed
解析：解析：这个简单的主意使农业发生了巨大变化。
11. A scientific report has found that snow and ice on Africa’s highest mountain Kilimanjaro ______rapidly and could vanish within 20 years.
    is melting was being melted
解析：解析试题分析：句意：一份科学报告表明：非洲最高的山脉乞力马扎罗山上的积雪和冰层正在快速融化，并可能在未来20年内彻底消失。表示现在正在进行的动作，故用现在进行时。
12. Finding information in today’s world is easy. The ______ is how you can tell if the information you get is useful or not.
    knowledge challenge
解析：解析试题解析：考查词义辨析。A知识；B能力；C竞争；D挑战。推测句意：在当今的世界，发现信息是很容易的，挑战是你如何辨别你所得到的信息是有用或没用的。其他选项不符题意，故选D。
13. The computer in the bedroom is _________.
    twins the twins'
解析：解析：电脑所在的卧室是双胞胎的房间。名词所有格，twin‘s
14. The sweater is too expensive. Could you show me a ___ one，please?
    long cheap
解析：解析试题分析：A.. Long长的；B. Cheap便宜的；句意：这件毛衣太贵了，请你给我一件便宜的好吗？结合句意，故选B
15. We all know travel can ＿＿＿ our knowledge of the world.
    discover .increase
解析：解析试题分析：句意：我们都知道旅游能增加我们的世界的了解。A. discover发现， B. increase增加。据句意，故选B。
16. — How terrible the weather is! I don’t like rainy days. — I ________ it, either. Because I can’t go to play soccer.
    dislike like
解析：解析试题分析：句意：天气是多么可怕！我不喜欢下雨天。我也不喜欢。因为我不能去踢足球。Dislike不喜欢；；like喜欢。所以选A。
17. Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
    exposed to expose
解析：解析试题分析：考查非谓语动词。本题考查短语be exposed to暴露与……。句意：处理这种化学物质时要小心，因为它暴露在阳光下时会爆炸。故A正确。 考点：考查非谓语动词
18. The problem with seeing famous tourist attractions is the steady＿of people all trying to see the place at the same time, so I doubt whether it is worth it
    pump stream
解析：解析试题分析：A. pump泵，打气筒，B. stream河流， 潮流，趋势，倾向；（事件等的）连续，（财富等的）滚滚而来； 流出，流注，一连串，句意：看著名的旅游景点的问题是络绎不绝的游客都试图在同一时间看到的地方,所以我怀疑是否这是值得的。这里用stream指“人流”，所以选B。
19. ll parents should _______ better with their children
    communicate work
解析：解析试题分析：；communicate 传达，交流；work工作，学习。句意：所有的父母都应该和他们的孩子更好的沟通。结合语境可知选A
20. t is well known that Germany’s car industry is its beer.
    as a symbol much as as much a symbol as
解析：解析这题考查as…as的用法，如果修饰可数名词，形容词放在冠词前面，结构是：as+adj.+a/an+as.句意是：众所周知，德国的汽车工业和它的啤酒一样是个标志。选B合适。