问题 选择题

短周期元素X、Y、Z、W在元素周期表中的相对位置如图所示。下列说法正确的是(    )

A.元素Z位于元素周期表中第3周期第ⅠA族

B.原子半径的大小顺序为:rW> rZ >rY> rX

C.Y、W元素的氢化物,其化学式都为H2R

D.离子Y2-和Z 3+的核外电子数和电子层数都相同

答案

答案:D

按照元素周期表中各元素位置确定元素名称:

A.元素Z位于元素周期表中第3周期第ⅢA族;

B.原子半径的大小顺序为:rZ> rW> rX> rY    ;

C.氧元素的氢化物还有H2O2.

阅读理解

Who wants to carry a bulky bag to school? No children. Nobody wants one shoulder to be lower than the other, and paining(疼痛) too. In India, most of us would look at the reduction(减少) of textbooks as a way out. But in a country like America, there are always more choices. A company called Goreader has created a “school bag” which is the size of a laptop computer, weighing about 2.5kg. The Goreader has a colour screen and can “hold” all the textbooks that a student may need, says a report in “The Asian Age” newspaper.

The company plans to work closely with the publishers of test books so that these books can be supplied on the Internet. All the students will have to download their textbooks. Making notes and marking important parts of a lesson can be done just as lots of students have done on their textbooks before.

At present, the plan is being tested out in a university. Richard Katzmann, the owner of the company is having his creation tested at Chicago’s DePaul University, where he studied. Does that mean it is goodbye to the newspaper, and the smell of the black ink?

小题1:What does the underlined word “bulky” in the first line mean?

A.light

B.small

C.big and heavy

D.old小题2:What would Indians do to solve this problem?

A.They would reduce the textbooks.

B.They would tell the parents to help students.

C.They would tell the teachers to help students.

D.They would take students to school by bus.小题3:The writer may think that Americans have a ______ way to solve the problem.

A.more stupid

B.worse

C.better

D.quicker小题4:The Goreader may be a machine ________.

A.that can work as a teacher

B.that can be used as textbooks

C.that can cheat(欺骗) students.

D.that can hurt students小题5: When the new machine is used, it is possible that ________.

A.students might study harder

B.students might study at home

C.students might not need teachers

D.students might study without paper textbooks

单项选择题