四六级考试

【单选题】 What is the author's purpose in writing this article
A．To justify the study of the Boston University Medical Center.
B．To stress the importance of maintaining proper weight.
C．To support the statement made by York Onnen.
D．To show the most effective way to lose weight.

【单选题】 Only those who can ______ to lose their money should make high-risk investments.
A．maintain
B．sustain
C．endure
D．afford

【单选题】 Which of the following would be the best title for the passage
A．Selling and Buying.
B．What Is the Market
C．Everything You Do Is Producing for the Market.
D．What the Market Can Do for You

【单选题】 The statement "People who have a sense of self-efficacy bounce back from failure" probably means that ______.
A．they are bound to failure
B．they usually draw back from failure
C．they will try to improve when faced with failure
D．they are inclined to wonder what to do

【单选题】 Why was Towne's early work with stimulated emission done with microwaves
A．He was not concerned with light amplification.
B．It was easier to work with longer wavelengths.
C．His partner Schawlow had already begun work on the laser.
D．The laser had already been developed.