函数y=x2-1和y=1-x2的图像关于（） (A)坐标原点对称 (B)x轴对称 (C)y轴对称 (D)直线茗+Y=0对称
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Many people believe that viruses cannot possibly be of importance in human cancer because_________．
A. they are innocuous agencies
B. they are the causative agents of most human cancer
C. they seem to be infections to many people
D. they are generally thought to be relevant to most cancer in mall
Adams nOW maintains that it is lessimportant to save the nation to a perilous future．
A. had alerted them
B. from alerting it
C. as to alert them
D. than to alert it
A.thatB.whenC.whatD.which
A. that
B. when
C. what
D. which
Which of the following statements is NOTtrue？
A. There are many forms ofcommunication in existence today．
B. Language is the mostcommon form. of communication．
C. Tourists are incapable ofusing an oral form. of communication．
D. Ideas and thoughts Can betransmitted by body language．
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