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【单选题】
下列蛋白质组分中，哪一种在280nm具有最大的光吸收A.
色氨酸的吲哚环
B.
酪氨酸的酚环
C.
苯丙氨酸的苯环
D.
半胱氨酸的硫原子
E.
肽键
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【简答题】He says that by the end of next year he (plant) 2000 trees.
【简答题】He says by the end of next year he _____ (plant) 2000 trees.
【单选题】When the author says 'I gave up' at the end, he means ______.
A.
he gave up his belief in the moral idea of the hare-and-tortoise story
B.
he gave up arguing with Tony
C.
he gave up Tony as a hopeless child
D.
he gave up trying to keep up with the new generation
【简答题】A．He says that he's got a basketball match ticket. B．He says that he's got to see some friends. C．He says that he has to see his parents. D．He says that the ticket is expensive.
【简答题】I believe __________, because he is ___ honest man. A．the words he says; a B．what he says; an C．he says what; the D．what does he say; an
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