单选题
The author implies that bacteria were investigated earlier than viruses because
A、
bacteria are easier to detect.
B、
bacteria are harder to eradicate.
C、
viruses are extremely poisonous.
D、
viruses are found only in hot climates.
【正确答案】
A
【答案解析】
[解析] 本题考查推理判断。文中讲：与细菌相比，病毒小到用光学显微镜都无法观察，也不能通过其生物活动来探查，所以比较容易观察和检测的细菌先于病毒被发现。故[A]是正确答案。
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