It is becoming increasingly urgent for us to know our family’s medical history, as more and
more diseases are found to have genetic 26 . Researchers are working to isolate all of the
body’s 50,000 to 100,000 genes and 27 them to specific diseases. It may be only a matter of
time before scientists 28 the genes that cause such common illnesses as diabetes and high
blood pressure. 29 unfortunately, time is not on our side. Hereditary diseases are a 30
potentially affecting many people in the world. 【題組】30. (A) number (B) piece (C) duty (D) crisis
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