單格填空第 14 題
Although plant and animal species that become established in ecosystems where they did not originate are sometimes referred to by the alarming term "invasive species," many such species are ______ in their new environments.
| Blank |
|---|
| (A) innocuous |
| (B) conspicuous |
| (C) robust |
| (D) menacing |
| (E) distinctive |
出處：OG, p.496, #1