Theories are tested by _______ practiceA.being ap

Which of the following sentences about those international tests are true except _____

________ they are observing can be tested in a practical way, scientists will use exp

The problem of the standard educational tests is caused by______.A．well－informed usersB．im

The AP estimated the speed of the train by______.A．the number of people killedB．the ruins

There are many theories about the beginning of drama in ancient Greece. The one most【C1】__

There are many theories that______to be able to predict whether you will give birth to a g