.Water and air are _______ to human beings. We can
.Water and air are _______ to human beings. We can not live without them.
A.harbour B.function C.definite D.essential
参考答案
您可能感兴趣的试题
Fatal error: Uncaught [XSException] ../../../usr/local/xunsearch/sdk/php/lib/XS.php(2559): Connection refused(C#111, localhost:8384)
thrown in /usr/local/xunsearch/sdk/php/lib/XS.php on line 2559
