试题与答案

The government of Pontran claims that Tor

题型:单项选择题

题目:

The government of Pontran claims that Tor City, one of the six major cities in that country, is alone among Pontran’s cities in having sustained p job growth this year. Clearly, however, any job growth there must be purely imaginary; in fact, in Tor City and only there, more people are unemployed this year than were last year.
The argument countering the government’s claim depends on the assumption that

A.unemployed workers in Pontran did not, in significant numbers, move to Tot City when the government claimed Tor City had p job growth.

B.the unemployment rate in Tor City is higher year than in any previous year.

C.actions taken by the government of Pontran significantly affect the unemployment rate in Tor City.

D.the unemployment rate in Tor City, though increased, is still the lowest of any city in Pontran.

E.(E) there is no significant seasonal variation in the unemployment rate for Pontran as a whole.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:是由几种酶彼此嵌合形成的复合体,相对分子量一般在几百万以上,例如脂肪酸合成酶复合体。

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题型:填空题

元素周期律和周期表是学习化学的重要工具,下表是元素周期表的部分信息。

周期

ⅠAⅡAⅢAⅣAⅤAⅥAⅦAO
23 Li

6.941

4 Be

铍

9.012

5 B

硼

10.81

6 C

碳

12.01

7 N

氮

14.01

8 O

氧

16.00

9 F

氟

19.00

10Ne

氖

20.18

311Na

钠22.99

12Mg

镁24.31

13 Al

铝26.98

14 Si

硅28.09

15 P

磷30.97

16 S

硫32.06

17 Cl

氯35.45

18 Ar

氩39.95

请认真分析表中信息,回答下列问题:

(1)地壳中含量仅次于氧的非金属元素符合是   ▲    

(2)   所表示的粒子符号为    ▲   ,它的原子最外层电子数为    ▲    

(3)由原子序数为8和12的两种元素组成的化合物是     ▲    (写化学式)。

(4)元素周期表同一横行元素的排列规律是:从左至右           ▲           

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