7-4Professional Ability Test(30分) Professional Ability Test (PAT) consists of several series of subject tests. Each test is divided into several levels. Level A is a prerequisite (前置要求) of Level B if

7-1 Panda and PP Milk PP milk （盆盆奶）is Pandas’ favorite. They would line up to enjoy it as show in the picture. On the other hand, they could drink in peace only if they believe that the amount of PP