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【单选题】
金属钛（Ti）是一种具有许多优良性能的较为昂贵的金属，钛和钛合金被认为是21世纪的重要金属材料．某化学兴趣小组在实验室探究Ti、Mg、Cu的活泼性顺序，他们在相同温度下，取大小相同的三种金属薄片，分别投入等体积等浓度足量稀盐酸中，观察现象如下： 金属 Ti Mg Cu 金属表面现象 放出气泡速度缓慢 放出气泡速度快 无变化 下列有金属的说法正确的是（ ）A.
三种金属的活泼性由强到弱的顺序是：Ti、Mg、Cu
B.
若Ti粉中混有Mg，提纯Ti时可用稀盐酸除去Mg
C.
用Ti从CuSO 4 溶液中置换出Cu是工业制取Cu的很好途径
D.
温度、金属表面积、盐酸浓度等因素都会影响反应速率
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【单选题】Scientific research has revealed that throughout the animal world, communication is just as important as it is to human beings. Countless animals lack the【C1】______for human speech, yet they employ en...
A.
simplicity
B.
curiosity
C.
capacity
D.
ability
【多选题】Banked cloze (10*2=20)【答案只填选项】 Official health advice that said household chores help keep you active has been proved wrong by the research, which shows that the people who do the most housework are a...
A.
) account E.) domestic I.) perspective M.) related
B.
) adjusted F.) gentle J.) positive N.) tendency
C.
) causes G.) objectively K.) practically O.) vigorous
D.
) compensate H.) outcomes L.) reinforce
【简答题】There are success stories. Bangladesh, once extremely dependent on food imports, has transformed its devastated agricultural sector into one of the most productive farm economies in all of South Asia ...
【简答题】请在资料一栏找到音频4-3-4,收听并完成下面练习 SECTION 4 Questions 31-40 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> Questions 31-34 Choose the correct letter, A, B or C. Trying to respect succ...
【判断题】4 Most research has also agreed that there is a positive role of instruction for grammar learning.
A.
正确
B.
错误
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