麻疹的病因是( )
A．腺病毒
B．溶血性链球菌
C．风疹病毒
D．水痘一带状疱疹病毒
E．麻疹病毒
参考答案：E
Most people think that it is ________ to spend some time surfing the Internet, but we shouldn't be too dependent on it.
A．worth
B．worthwhile
C．worth of
D．worthy of
英文“greatwall”指的是中国的什么建筑物？
