单选题The idea that machines could be made to fly seemed ______ two hundred years ago.
单选题How long did it take the patient to resume her normal activity after the operation? ______.
单选题The loyalty of dogs to their masters has earned ______"man's best friend."
单选题Education and experience in these areas may be necessary to train one competently to prescribe and monitor medications, and hence to decrease potential ______.
单选题The timber rattlesnake is now on the endangered species list, and is extinct in two eastern states in which it once______. A. thrived B. swelled C. prospered D. flourished
单选题In scientific inquiry, it becomes a matter of duty to expose a______hypothesis to every possible kind of examination.
单选题The lack of money and facilities depressed and ______ them a lot.
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单选题The adjustment by retarding growth and arresting vital functions during winter may result in the leaf fall of middle latitude
deciduous
trees.
单选题The merit of a sales tax is that it decreases government reliance on income taxes.
单选题The conference was held in a hall ______ by a number of rows of large lamps.
单选题The cells(电池)were designed to ______ sunshine to electricity to run a motor.
单选题Ms. Rice, with customary class, simply expressed hope that this episode wouldn't ______ the charity in spite of the previous scandal.
单选题$50 billion might seem a lot of money, but it's a mere ______in terms of what global capital marketts can and do absorb. A. alms B. belongings C. hearsay D. pittance
单选题The doctor ______ me to the danger of not getting enough sleep.
单选题The connoisseurs" opinions differed greatly as to the question whether the picture on show was a(n) ______ Picasso painting.
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单选题While we plan our railway buildings with a life span of 100 years, we also know that a quake measuring over seven on the Richter scale might ______ once in 120 years, though we never expect it to happen so soon.
单选题According to the passage, a country is probably decided by ______.
单选题It can be inferred from the passage that we could have learned much more about our past than we do now if our ancestors had______