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We live on the earth. We use the sea around us. What do we take from the ocean? And what do we give to it? We take fishes from the ocean—millions of kilograms of fish, every year, to feed millions of people. 小题1: We take minerals(矿物) from the ocean. We can get salt by evaporating(蒸发) seawater. 小题2: Many other minerals, such as gold, can be also got from the sea, but not by simple evaporation. 小题3: Seaweed(海草) becomes food of many kinds— even candy, and ice cream—as well as medicine. Believe it or not, fresh water is another gift from the sea. We can’t drink ocean water. 小题4: But ocean water becomes fresh water when the salts are removed. In the future, we will find ourselves depending more and more on fresh water from the sea. The sea gives us food, fertilizer, minerals, water and other gifts. What do we give the sea? We pollute the ocean all the time. ____小题5:____Throwing waste into the ocean is killing off sea life. Yet as the world population grows, we may need the sea and its gifts more than ever. We are finally learning that if we destroy our sea, we might also destroy ourselves. Hopefully, it is not too late. 根据以上内容,从下列五个选项中选择适当的句子还原到短文中,使短文完整与正确。将其标号在答题卡上。(每小题2分,共10分) A. Other gifts from the sea , such as seaweed, can be also got from the sea. B. Huge as it is, the ocean can’t hold all that we pour into it. C. Along with salt, other minerals are left after evaporation. D. We even use their bones(骨头) for fertilizer(化肥). E. Some of its contents(所含物) may cause illness.
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【判断题】病毒与质粒的主要区别是,病毒能以非感染态存在于环境中,长期保持其感染力。
A.
正确
B.
错误
【单选题】下列选项中属于接头连接零件的是
A.
道钉
B.
弹条式扣件
C.
钢轨接头夹板
D.
扣板式扣件
【单选题】下列选项中,属于零件的是( )。
A.
曲轴飞轮组
B.
齿轮轴组件
C.
活塞连杆组
D.
螺栓
【单选题】下列选项中,属于零件的是( )。
A.
发动机曲轴连杆总成
B.
齿轮轴组件
C.
D.
凸轮轴总成
E.
螺栓
【多选题】下列选项中属于零件的是( )
A.
发动机活塞
B.
螺栓
C.
D.
齿轮
【单选题】甲氧苄啶抗菌机理是
A.
抑制细菌蛋白质合成
B.
抑制细菌二氢叶酸还原酶
C.
抑制细菌细胞壁合成
D.
抑制细菌二氢叶酸合成酶
【单选题】(2005全国联赛,62)质粒与病毒的主要区别是:
A.
质粒 DNA 是环状的
B.
质粒可以在大肠杆菌内繁殖
C.
质粒 DNA 与蛋白质结合
D.
病毒基因组能编码外壳蛋白
【单选题】下列选项中,属于零件的是( )。
A.
发动机曲轴连杆总成
B.
齿轮轴组件
C.
凸轮轴总成
D.
螺栓
【单选题】甲氧苄啶的抗菌机理是
A.
破坏细菌细胞壁
B.
改变细菌细胞膜通透性
C.
抑制敏感菌二氢叶酸合成酶
D.
抑制敏感菌二氢叶酸还原酶
E.
增强动物机体抵抗力
【单选题】甲氧苄啶抗菌机理是
A.
抑制细菌蛋白质合成
B.
抑制细菌二氢叶酸还原酶
C.
抑制细菌细胞壁合成
D.
抑制细菌二氢蝶酸合成酶
E.
影响细菌胞浆膜通透性
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