304. A landing on Mars is within the _____ of current physical theory.

   A. scheme    B. scope    C. scrap    D. scale

[答案] B . scope.

     [注释] scope 范围，活动范围，理解犯围: 1 Many words are outside the scope of this dictionary. (许多单词是超出了这本词典的范围.) 2 Very hard words are not within the scope of a child's understanding。(非常难懂的 词是超出了一个孩子的理解范围.) 3 Economics is beyond the scope of a child's mind.(经济学是孩子理解不了的.)

303. You will get to the church more quickly if you take this _____ across the fields.

   A. track    B. passage    C. method    D. journey

[答案] A. track.

     [注释] track(=path made by frequent use)意指"(常走而踏成的)小径"，如:a track across the moor(越过荒野的小径)。passage"通路"，如:force a passage through a crowd(在人群中挤出的一条通路). 可见此处选passage不妥.

302. He gave me some very _____ advice on buying a house.

   A. precious    B. worthy    C. precise    D. valuable

[答案] D. valuable.

     [注释] valuable 宝贵的，有价值的，常可修饰advice， suggestion， assistance， discovery等名词。 precious"贵重的"如: precious metals(贵金 属)，precious stone(宝石)。

301. The writer was always looking for suitable _____ to use in his next story.

   A. contents    B. articles    C. notions    D. ideas

[答案] D. ideas.

     [注释] idea(= thought； picture in mind)念头，思想，想法。

300. I shall take you back to Beijing _____ you are well enough to travel.

   A. presently    B. promptly    C. immediately    D. shortly

[答案] C. immediately

     [注释] immediately(=directly) 作连词用，意为"一……就……"，相当于 as soon as .

299. Our house is the most _____ one in the street; it is painted red.

   A. permanent    B. indifferent    C. predominant    D. prominent

[答案] D. prominent.

     [注释] prominent 突出的；突起的。indifferent 漠不关心的；permanent 永久 的；predominant 占优势的，主要的。

298. It has been laid down that each student must _____ a composition to the teacher once a week.

   A. turn in    B. give up    C. put forward    D. bring out

[答案] A. turn in.

     [注释] turn in(=hand in) 上交。

297. Radium salts, which have been found to _____ in bones, give rise to cancers of the bone.

   A. pile up    B. build up    C. keep up    D. pull up

[答案] B. build up.

     [注释] build up(=accumulate) 积累。pile up 堆积。keep up 保持，维持。 pull up 停车。

296. Having said he would mend the clock, he discovered that he had not brought the _____ tools for the job.

   A. concise    B. correct    C. right    D. precise

[答案] C. right.

     [注释] right 适当的，恰当的:He is the right man to do the job。(他是干这 项工作的合适人选) concise 简明扼要的，correct 正确的；exact 确切的： exact time 确切的时间，exact age 确切的年龄，exact weight 确切的重量； exact weight 确切的重量；exact information 确切的信息；exact cause 确切 的原因；exact meaning 确切的意思。

295. The country needs a _____ government. We have had three Prime Ministers in a year.

   A. stationary    B. changeless    C. constant   D. stable

[答案] D. stable.

[注释] stable 稳定的。stationary 静止的，不变的，固定的。changeless 不变 的 ，无变化的。constant 经常不断的。