The purpose of the author in writing this passage is
A. to comment and criticize.
B. to demonstrate and argue.
C. to interest and entertain.
D. to explain and inform.
查看答案
A．decisiveB．discernibleC．incredibleD．negligible
A. decisive
B. discernible
C. incredible
D. negligible
A．in generalB．in effectC．for exampleD．in a sense
A. in general
B. in effect
C. for example
D. in a sense
What does the example of the Smallpox Vaccine illustrate？
A possible negative outcome of administering vaccines.
B. The practical use of a vaccine to control an epidemic disease.
C. A method by which vaccines are employed against the disease.
D. The effectiveness of vaccines in curing certain disease.
A．accommodatingB．discardingC．embracingD．presenting
A. accommodating
B. discarding
C. embracing
D. presenting
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