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【简答题】
朊病毒是由1997 年诺贝尔奖获得者-- 美国生物化学家坦发现的，其本质是具有感染性的蛋白质，能引起“瘙痒症”和“疯牛病”（症状：丧失协调性，站立不稳，烦躁不安，奇痒难熬，直到瘫痪死亡），人的朊病毒已发现四种。 （1）朊病毒的遗传物质是什么？_____________ 。 （2）牛为什么会得“疯牛病”？________________ 。 （3）朊病毒属于病毒中的哪一类？________________ 。
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A.
reads
B.
read
C.
which reading
D.
which reads
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A.
a little; any
B.
a little; some
C.
little; some
D.
little; any
【单选题】We confirm our faxjust sent _________ these goods.
A.
firm offering you
B.
offering you firm
C.
to be offered to you firm
D.
to firm offer you
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