单项选择题
The author implies that allelomimetic behavior occurs most often among animals that ______.
单项选择题 ______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.
单项选择题 Most of the earliest ______ into America came from Europe.
单项选择题 I Called at his house but was refused ______.
