89.How acupuncture reduces and r________ pain is unclear.

88.New digital mobile phones produce less radiation, but that does not n________ mean that they should be uses without caution.

87.It uses an AAA battery (included) and has a one-year g________.

86.The ________(应用) of penicillin is still popular in medical treatment today.

85.The ________(标准化) test has both advantages and disadvantages.

84.Although the novel was written decades ago, it still has a ________(当代的) feel to it.

83.This newly-designed machine is s________ in many respects to the old one.

82.A q________ is a written list of questions that are answered by a number of people so that information can be collected from the answers.

81.To some d________, the measure took some effect. But the environment has not been much improved.