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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Color is very important to most animals for it helps them to get along in the world. Color (21) to make an animal difficult for its enemies to (22) . Many animals match their (23) so well that as lon...
A.
Even if
B.
Unless
C.
However
D.
As long as
【多选题】全背按摩的正确方法是（）
A.
协助患者俯卧，露出背部
B.
先以热水擦洗，再用小毛巾蘸50%乙醇按摩
C.
从骶尾部开始，用手掌沿脊柱旁向上按摩
D.
至肩部时，以环状动作向下按摩
E.
用拇指指腹由骶尾部开始沿脊柱按摩至第7颈椎处