问题
选择题
Animals should not be locked in cages; they should be in their normal _____.
A．environment
B．position
C．residence
D．dwelling
答案
答案：A
environment(="surroundings," circumstances)环境，environment作集合名词用时，只用单数形式：We should work hard to improve our environment. (单词，不可数)Children need a happy home environment. (单数，可数)