40. According to the passage, which of the following is NOT true?

(A) Water service line replacement could increase the exposure to lead while the work is proceeding.

(B) Medical and public health experts agree that there is no safe level of lead in the human body.

(C) Water sampling results can be different depending on the time of day, season, and method of sampling.

(D) The most important thing is to look for a certified laboratory to identify lead contamination.
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Early risers are people who naturally wake up early in the morning. Their body clock causes them to get up while most
of us are still in deep sleep. Researchers said early risers could have some shared DNA from Neanderthals – our 41 who
lived over 40,000 years ago. Neanderthals lived in northern parts of Europe and Asia. They woke up earlier to hunt for or
gather food as the sun 42 . Scientists have spent a long time looking at why some people are early birds, while others
are night owls. They looked at a medical database with 43 information for hundreds of thousands of people. They
compared the DNA of people who said they were early risers with the Neanderthal DNA. Their research found more
examples of Neanderthal DNA 44 in the early risers. However, it is likely that the Neanderthal DNA is not so strong
in many people. The effect of the Neanderthal DNA may be 45 as the centuries pass. Our modern lifestyles mean
many of us prefer sleeping in to leaving the comfort of our bed. Nevertheless, it may still be true that the early bird catches
the worm.