It is reported that a new planet has been discovered recently. It's _____ Earth, and hopefully it can support

human life. [ ]

A. almost three times the size of

B. three times the size than

C. three times almost as large as

D. almost three times as larger as

带虫者（）.

A．寄生虫感染后不表现临床症状 

B．寄生虫感染后不易用常规方法检出 

C．两者均是 

D．两者均不是