The orchid is unique because of______. Which of the following statements about orchids scents does the passage support?

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问题 The orchid is unique because of______.
Which of the following statements about orchids scents does the passage support?

选项 A、They are effective only when an insect is near the blossom.
B、Harmful insects are repelled by them.
C、They are difficult to tell apart.
D、They may change at different times.

答案D

解析

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The orchid is unique because of______. Which of the following statements about orchids scents does the passage support?

公共英语四级笔试

公共英语（PETS）

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