61. Columbus‘ decision to sail west to reach the East _____ on his belief that the earth was round.

　　A. existed

　　B. sat

　　C. relaxed

　　D. rested

　　正确答案是

　　62. Despite the wonderful acting and well-developed plot the _____ movie could not hold our attention.

　　A. three-hours

　　B. three-hour

　　C. three-hours‘

　　D. three-hour‘s

　　正确答案是

　　63. Difficulties can _____ a person‘s best qualities.

　　A. bring up

　　B. bring out

　　C. bring about

　　D. bring to

　　正确答案是

　　64. Doctors sometimes _____ old cures when modern medicine doesn‘t work.

　　A. fall on

　　B. fall down on

　　C. fall back on

　　D. fall in upon

　　正确答案是

　　65. Does brain power _____ as we get older？ Scientists now have some surprising answers.

　　A. descend

　　B. decline

　　C. deduce

　　D. collapse

　　正确答案是

　　66. Doing your homework is a sure way to improve your test scores， and this is especially true _____ it comes to classroom tests.

　　A. when

　　B. since

　　C. before

　　D. after

　　正确答案是

　　67. Don‘t worry. The company will _____ all your expense.

　　A. satisfy

　　B. meet

　　C. pay

　　D. submit

　　正确答案是

　　68. Eventually， people spread throughout the continent， ______ the entire species.

　　A. wiping out

　　B. wiping away

　　C. wiping off

　　D. wiping up

　　正确答案是

　　69. Experts say walking is one of the best ways for a person to ______ healthy.

　　A. preserve

　　B. stay

　　C. maintain

　　D. reserve

　　正确答案是

　　70. Faced with the ______ difficulties， they are determined to carry on their program.

　　A. satisfactory

　　B. attributable

　　C. innocent

　　D. intangible

　　正确答案是