题目内容

Which statement about normal flora are right __________.

A. Inhibit R plasmid spread among different bacteria species.
B. Activate immune cells;
C. Antagonism against foreign bacteria;
D. Provide Vit.K to the host;

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Directions: There are 10 incomplete sentences in this part. For each sentence there are 4 choices marked A, B, C and D. Choose the answer that best completes the sentence.1. She held her hands above her eyes to them the sun so that she could see more clearly the man in front of her.

A. count … on
B. make sense … of
C. reserve … for
D. shield … from

2.The boy studied the signs for over an hour, but still could not __________ them, so he turned to his teacher for help.

A. count on
B. make sense of
C. reserve for
D. shield from

3.They __________ the developed countries to commit more money to protecting the environment.

A. called on
B. sumed up
C. in need
D. shielded from

4.We will continue to care for those __________ and work to establish a society that is generous and prosperous.

A. count on
B. make sense of
C. reserve for
D. in need