When a competitive antagonist is present, the dose-response curve of the agonist（）
A. Unchanged
B. Parallel right shift
C. Parallel left shift
D. Rise
E. Decline
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目前最广泛应用于临床磁共振成像技术的原子核是（）
A. 1 H氢
B. 19
C. F 氟
D. C．钠 （23 Na）
E. D．磷 （31 P）
F. E．其它
Which of the following is NOT a way of finding the meaning of words（）
A. Guessing from the context
B. Consulting a dictionary
C. Analyzing the word-formation
D. Ignoring it
Which of the following does NOT contain a non-finite clause（）
A. He stopped to look at the poster
B. My brother lived in Kent for twenty-three years
C. I’m looking forward to going to London
D. The sandstorm having stopped, we all went out to get some sunshine
Which of the following may be possible interpretations for the sentence ‘It’s cold in this room’（）
A. I’ll take off my coat
B. Open the door
C. Let’s go somewhere else
D. Turn on the air-conditioner
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