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【简答题】
金属材料与人类的生产、生活息息相关。 （1）人们习惯上称为“五金”的金、银、铜、铁、锡中，把金属______（填元素符号）的位置移到最后，正好符合金属活动性由 （填“强到弱”或“弱到强”）的顺序，其中可以和稀硫酸发生化学反应的金属是 。 （2）下图所示生活用品中，主要利用金属导热性的是_____，延展性的是______（填字母序号）。 （3）从、银、锰（Mn）的混合粉末中分离出某种金属，并获得一种晶体，设计的实验流程如下。 ①硫酸盐中A元素的化合价为+2，请写出加入足量稀硫酸时反应的化学方程式： 。 ②生成金属C的化学方程式是 。
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【单选题】They want to buy a forty-foot sailing boat ______ they plan to sail around the world.
A.
that
B.
for which
C.
on which
D.
where
【简答题】A．Golden Gate is the name given to a bridge and a boat sailing under the bridge. B．Commuters prefer high-speed boats but tourists are attracted to more leisurely ones. C．People have to cross the Golde...
【单选题】Sailing boat is considered to be a luxury,________.
A.
quantity demanded tends to respond slightly to a change in price
B.
demand tends to be elastic.
C.
the law of demand often does not apply.
D.
All of the above are correct.
【简答题】AE填写表达式的方法是( )
【单选题】Sailing down the Yellow River,______.
A.
the boat hits a rock
B.
an accident had happened
C.
the boat hit a rock
D.
a terrible accident happened
【简答题】Over a hundred years ago people in London were surprised to see a very unusual boat come sailing up the Thames River.The boat was eighty feet long flat-bottomed,with big wooden eyes on both sides in t...
【单选题】The Sydney Opera House is like a huge sailing boat with water ____ three sides.
A.
at
B.
of
C.
in
D.
on
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