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【单选题】
下列有关说法正确的是( ) A.H2SO4的酸性比HClO的酸性强,所以S的非金属性比Cl强 B.Mg(OH)2是中强碱,Al(OH)3是两性氢氧化物,所以Al比Mg活泼 C.H2S 300 °C时开始分解,H2O 1 000 °C时开始分解,说明O的非金属性 比S强 D.Na和Mg与酸都能剧烈反应放出氢气,故无法比较它们的金属性强弱A.
B.
C.
D.
D
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【单选题】A demand curve of a normal good
A.
has an upward slope.
B.
has a downward slope.
C.
is a graph of the relationship between quantity demanded of a good and its price.
D.
Both answers B and C are correct.
E.
Both answers A and C are correct.
【简答题】激动的,戏剧性的 adj . ( )
【简答题】翻译以下句子: 1 、 People going shopping in America can expect to be treated with respect from the very beginning。 2、Most places don‘t have a“ furniture street” or a“ computer road” which allow you to compar...
【单选题】If a good is "normal," then an increase in income will result in
A.
no change in the demand for the good.
B.
an increase in the demand for the good.
C.
a decrease in the demand for the good.
D.
a lower market price.
【单选题】用（a，b）表示a，b两数的最大公约数，[a，b]表示a，b两数的最小公倍数，例如（4，6）=2，（4，4）=4．[4，6]=12，[4，4]=4，设a，b，c，d是不相等的自然数，（a，b）=P，（c，d）=Q，[P，Q]=X；[2，6]=M，[c，d]=N，（M，N）=Y．则（ ）
A.
X是Y的倍数，但X不是Y的约数
B.
X是Y的倍数或约数都有可能，但X≠Y
C.
X是Y的倍数、约数或X=Y三者必居其一
D.
以上结论都不对
【简答题】（15分） M、N、O、P、Q是元素周期表中原子序数依次递增的前四周期元素。M原子最外层电子数为内层电子数的3倍；N的焰色反应呈黄色；O的氢化物是一种强酸，其浓溶液可与M、Q的化合物反应生成O的单质；P是一种金属元素，其基态原子中有6个未成对电子。请回答下列问题： （1）元素Q的名称为__________，P的基态原子价层电子排布式为__________ 。 （2）O的氢化物的沸点比其上一周期同族...
【单选题】Which of the following would most likely cause a decrease in the current demand for a normal good?
A.
An increase in the price of the good.
B.
An increase in the expected future price of the good.
C.
A decrease in the price of a complement for the good.
D.
None of the above would be likely to cause a decrease in current demand for a normal good.
【简答题】Do you have a ____? 您有预定吗? 2. How long will you be ____, please? 您准备住多久? 3. How would you like to ____, please? 请问您用什么方式付款? 4. Could you ____ your name here, please? 能在这儿签名吗? 5. May I see your ____? 可...
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