单项选择题

By writing the passage, the author most intends to ______.

A. introduce the joint expedition
B. introduce the "Coral Triangle"
C. highlight the meaningfulness of deep-sea exploration
D. highlight the marine diversity of the "Coral Triangle"

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单项选择题

What is mentioned as a disadvantage of food challenge

A. People are unaware of what they are eating.
B. People may be given frightening food to eat.
C. The food may cause life-threatening allergy.
D. It takes much time to get the food prepared.

单项选择题

According to Dr. Shank, the Wallace Line ______.

A. hasn’t been hilly accounted for
B. doesn’t really exist
C. can justify the marine diversity
D. is derived from undersea