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【多选题】
噪声对人体的影响是全身性的,主要表现在A.
听觉系统
B.
神经系统
C.
心血管系统
D.
消化系统
E.
内分泌及免疫系统
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【简答题】质粒运载体用EcoRI切割后产生的片段如下: AATTC......G G......CTTAA 为使运载体与目的基因相连,含有目的基因的DNA除可用EcoRI切割外,还可用另一种限制性内切酶切割,该酶必须具有的特点是___________________。
【简答题】I shall never forget the day when the earthquake took place. The time was about 5 o’clock in the afternoon and I was driving along the road to take my daughter from school. Our plan was to go swimming...
【简答题】I had hidden the long black bag in the garage for the past two days. Tonight, in the dark, I would finally take it away. If everything went OK, it would be done by morning. But I had to be sure no one...
【单选题】瘦肉精是一类对人体健康危害极大的化学物质，政府已严禁在猪饲料中添加瘦肉精．常见的瘦肉精化学式为C 12 H 18 OCl 2 N 2 ，下列有关这种瘦肉精的说法中正确的是（ ）
A.
是一种无机化合物
B.
分子中碳、氢、氧三种元素的质量比为72：9：8
C.
相对分子质量为277g
D.
由C 12 H 18 O、Cl 2 、N 2 三种分子组成
【单选题】阅读本文完成单项选择21--25题 I shall never forget the day when the earthquake took place. The time was about 5 o’clock in the afternoon and I was driving along the road to take my daughter from school. Our plan ...
A.
on his way to the Post Office
B.
stopping off at a shop
C.
doing some shopping
D.
under a road built like a bridge
【简答题】My plan was never to humiliate him, but to let him know the truth.
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