1. Scientists have to work hard to keep _____ with modern discoveries and developments.
A. company B. track C. touch D. pace

[答案]D. pace.
[注释]keep pace with 跟上：1)This horse is too weak to keep pace with the others. 2)I can’t help pace with your plan.Keep in touch with 与......保持联系；了解（情况）；1)People can keep in touch with each other even when they do leave. 2)I find it very difficult to keep in touch with all the recent developments in my subject.(我觉得很难了解我的科目当前的一切新发展。)Keep company(with)与......相好：Never keep company with dishonest persons.(千万不要和不诚实的人来往。)Keep track of 通晓事态，了解动向：I find it difficult to keep track of my old friends.(我很难了解我的老朋友的情况。)keep track of 的反义结构是lose track of（失去联系）考生务必熟记。

2. He didn’t _____ what I read because his mind was on something else.
A. hold on B. catch on C. take in D. get over

[答案]C. take in
[注释]take in(=understand)理解。hold on(打电话时)不要挂断；catch on 明白（作不及物动词用），catch on to 懂得，明白（作及物动词用）；get over 克服。

3. We made plans for a visit but _____ difficulties with the car prevented it.
A. consequent B. subordinate C. substantial D. subsequent

[答案]D. subsequent.
[注释]subsequent(=later, following)随后得，接着发生的：subsequent events（随后发生的事件）。consequent(作为结果)而随之发生的：His long illness and consequent absence put him behind in his work.根据题意，本题用subsequent 更妥。

4. Arrogance and pride are similar in meaning, but there is _____ difference between them.
A. a submerged B. an indecisive C. an indistinct D. a subtle

[答案]D. a subtle.
[注释]subtle 微妙的，微细的，难以捉摸的。a subtle difference.（微细的差别）。Submerged 浸没的；indecisive 非决定性的，非结论性的，未清楚标明的；indistinct 不清楚的，模糊的；subconscious 下意识的。

5. This watch is _____ to all the other watches on the market.
A. superior B. advantageous C. super D. beneficial

[答案]A. superior.
[注释]superior。上级的；优秀的，出众的；高傲的。