围绕——____
观赏——____
明丽——____
波澜壮阔——____
— Linda, how are you ________ with your new classmates?
— At first, I felt ________, but now we are good friends.
已知丙烷的二氯代物有四种异构体，则其六氯代物的异构体数目为（ ）
