[单项选择]You have to be ______ when you try to work out mathematical formulas.
A. reasonable
B. rational
C. logical
D. sound

[单项选择]You have to be ______ when you try to work out mathematical formulas.
A. reasonable
B. rational
C. logical
D. sound

[单项选择]It matters not what you try to carry out, but when you once try to carry out a thing, you must never give it up until you have done it thoroughly and well.（）
A. 你完成的是什么事并没有什么关系，不过一旦想要做一件事，而且从未放弃过，你就能把这件事完全做好。
B. 你要完成什么事并不重要，不过一旦想要完成一件事，就必须契而不舍，直到把这件事彻底做好为止。
C. 不管你怎么做一件事，不过当你想要完成这件事，你有从来不放弃，你就会把这件事做得非常好。
D. 不管你要做什么事，你只要想去完成这件事，而且从来没有放弃这个想法，你就一定能做得非常完好。

[单项选择]When once you have caught the disease, you are {{U}}immune{{/U}} from it for the rest of your life.
A. free
B. busy
C. calm
D. impatient

[单项选择]

When you have completed your college education,you will look for a job suited to your training,interests,and ambitions(志向).In most cases,you will visit a likely employer’s office and complete an application form for the position in which you are interested.The employer may then make a decision regarding your ability on the basis of the application form and a personal interview. Throughout your lifetime,however,you may find yourself in other job-seeking situations in an attempt to improve your position.As you gain experience,you are likely to become ambitious for better and better jobs.These better jobs often request written letters of application and summaries of your background and experience.Your writing skills may play an important part in obtaining the job you desire. In any job-seeking situation,there are a number of ways you may use your writing skills:to complete an application form,prepare a resume,write an application letter,or write employment follow-up letters.As
A. will follow their interests and ambition
B. like to visit every employer's office
C. can make an arrangement for an interview
D. will surely get a chance to improve position

[单项选择]Try to work out the problem ______.
A. all by yourself
B. by you
C. all by yours
D. by your

[单项选择]You must try to wipe out the memory of these horrible events.
　　


A. strange
B. terrible
C. unusual
D. unfair

[单项选择]Only when you have accumulated enough credits will you be ______ to apply for the degree.
A. elementary
B. ethnic
C. eligible
D. elegant

[单项选择]When you finish reading the book. you will have ______ better understanding of ______ life.
A. a; the
B. the; a
C. /;the
D. a;/