【简答题】用方框内所给单词的适当形式完成短文。 learn, question, problem, be, help, little, good, much, happy, teach, attitude, how Have you ever had problems in your life that got in the way of your happiness? If so, you will fi...
【单选题】The modern age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is hard to imagine what life would be like without them. When there is a pow...
A.
Electric eels are potentially dangerous.
B.
Biology and electricity appear to be closely related.
C.
People would be at a loss without electricity.
D.
Scientists still have much to discover about electricity.