第2题
A.69 days.
B.104 days.
C.150 days.
第4题
According to the passage, the more protein a rat consumes, the lower will be the
A.ratio of the rat" s blood-tryptophan concentration to the amount of serotonin produced and released in the rat"s brain.
B.ratio of the rat"s blood-tryptophan concentration to the concentration in its blood of the other amino acids contained in the protein.
C.ratio of the rat"s blood-tyrosine concentration to its blood-leucine concentration.
D.number of neurotransmitters of any kind that the rat will produce and release.
E.number of amino acids the rat" s blood will contain.
第5题
Does that include the turnover()in advance?
A、 to receive
B、 received
C、 receiving
第8题
Adequate training will reduce the turnover and improve the customer service.()
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