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【单选题】
Why does the author say reducing the amount of meat in one's diet is environmentally beneficial?A.
People who eat meat usually have weaker immune systems compared to those of vegetarians.
B.
A lot of food and water are consumed in order to raise livestock.
C.
90% of animals are raised in confinement.
D.
Raising animals causes most of the destruction of nature.
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【单选题】（2002）男，56岁。心房颤动患者，突然发生命名物名困难。2周来共发生过5次，每次持续2～15秒。查体无神经系统异常。脑CT无异常。主要累及的血管是
A.
基底动脉系
B.
椎动脉系
C.
颈内动脉系
D.
大脑后动脉
E.
大脑前动脉
【单选题】Carol thinks that political problems
A.
don't get reported in the way they should be reported
B.
are not really interesting for most people
C.
are presented well by TV reporters
【单选题】Which of the following is true of Livingston? ______
A.
He thinks he has discovered a new possibility in the link between sun spots and the weather on the Earth.
B.
He has great doubts about the theory that the sun's frequent changes have an influence on the Earth's climate.
C.
He has been recently informed by other scientists of the possibility that more sun spots will appear.
D.
He does not think the causes of the sun spots will be fully revealed by scientists in the near future.
【单选题】男，56岁的心房颤动患者，突然发生命名物困难。两周来共发生过5次，每次持续2～15秒。查体无神经系统异常。脑CT无异常。 可能的诊断是
A.
脑动脉瘤
B.
脑血栓形成
C.
脑出血
D.
脑血管畸形
E.
短暂性脑缺血发作
【单选题】男，56岁，心房颤动患者，突然发生命名物名困难。2周来共发生过5次，每次持续2～15秒。查体无神经系统异常。脑CT无异常。可能的诊断是
A.
脑动脉瘤
B.
脑血栓形成
C.
脑出血
D.
脑血管畸形
E.
短暂性脑缺血发作
【简答题】一氧气瓶内装有氧气,瓶上装有压力表,若氧气瓶内的容积为已知,能否算出氧气的质量。
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