What do Ho's words 'Bear in mind that undetectable does not equal absent' mean? A.AIDS virus can exist in the blood without being detecteD. B.AIDS virus is undetectable in the blooD. C.No ADS virus can be detected in the blooD. D.No virus found in the blood means no ADS.
A.AIDS B. B.AIDS C. C.No D. D.No
【参考答案】
A 解析：对这句话的理解要结合第五段整体考虑。该段开头说The drugs have knocked the A......