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【单选题】
The U.S. Department of Agriculture played an important role in agricultural developments byA.
adopting hybrid seeds and genetic engineering of plants.
B.
advocating the wide use of fertilizers and pesticides.
C.
improving the environmental conservation of lands.
D.
providing farmers with extension service of education.
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举一反三
【多选题】传染性疾病对实验动物生产和使用带来哪些危害（）。
A.
携带人畜共患病原体，直接危害人类和动物的健康
B.
影响动物的生产，烈性传染病可导致整个动物群的毁灭
C.
使整个动物群带毒，带毒群体很难净化，会反复爆发疾病
D.
干扰实验结果
【单选题】关于血压的生理性变化，错误的叙述是（ ）。【历年考试真题】
A.
小儿血压低于成年人
B.
中年以前女性血压低于男性
C.
清晨血压低于傍晚
D.
上肢血压低于下肢
E.
寒冷环境血压低于高温环境
【简答题】试述血压的生理性变化。
【单选题】The plane was flying normally for about 15 minutes before a warning light started blinking.
A.
opened very quickly
B.
happened very quickly
C.
turned on
D.
flashed on and off
【单选题】The plane was flying so low that it nearly ripped the roof of a house.
A.
to tear away violently
B.
to produce, display, or utter suddenly
C.
to subject to violent criticism or attack
D.
None of the above
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