An increase or enhancement of activity by a drug is（）
A. Excitation
B. General action
C. Inhibition
D. Local action
Etiological treatment
F. Symptomatic treatment
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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
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
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