单项选择题

In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the best answer to each question on ANSWER SHEET TWO.
The dental hygiene includes all of the following EXCEPT ______.

A. brushing your teeth twice a day
B. flossing your teeth once a day
C. avoiding eating salty snacks
D. seeing your dentists twice a year
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单项选择题
Which of the following is NOT included in the process of defense identification
A. Cancer cells destroy different carbohydrates of the body.
B. People feel the things that are not of themselves.
C. People make immune responses to those cancer antigens.
D. Antibody response is detected by the blood test.
单项选择题
The last G20 summit took place in ______.
A. Japan.
B. Canada.
C. South Korea.
D. Brazil.
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