A.RAT未完全收存
B.在RAT收存做动筒上存在压力
C.RAT泵不可用
D.以上都正确
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.
A.Rat, Dog, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Pig
B.Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig
C.Rat, Tiger, Ox, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig
D.Rat, Ox, Tiger, Rabbit, Snake,Dragon, Horse, Goat, Monkey, Rooster, Dog, Pig
A.ox, pig
B.rat, dog
C.tiger, monkey
D.rat, pig
A.Race that involves many people
B.Small and not severe competition
C.Fierce competition
D.Race for rat
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