Text 4
Learning science helps children to develop ways of understanding the world around them. For this they have to build up concepts which help them link their experiences together; they must learn ways of gaining and organizing information and of applying and testing ideas. This contributes not only to children’s ability to make better sense of things around them, but prepares them to deal more effectively with wider decision-making and problem-solving in their lives. Science is as basic a part of education as numeracy and literacy; it daily becomes more important as the complexity of technology increases and touches every part of our lives.
Learning science can bring a double benefit because science is both a method and a set of ideas; both a process and a product. The process of science provide a way of finding out information, testing ideas and seeking explanations. The products of science are ideas which can be applied in helping to understand
A. making better sense of things around them
B. improving their decision-making ability
C. cultivating their problem-solving ability
D. developing their total personality
Passage Five
A new kind of radar has been developed for spaceship travelers. A working laboratory model of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate than the best comparable system of radar that used microwaves.
The model has shown that this radar system, known as laser-doppler radar, can measure with absolute precision speeds varying from spaceship orbital injection (进入) velocities (速度) of five miles per second down to virtual stops--speeds of less than one ten thousandth of an inch per second. According to the scientists who are developing this system, such fine measures of velocity are of prime importance in space missions. In a rendezvous (对接) between two spaceships, or in a landing approach by a vehicle onto an orbiting space station, a bump could rip open a ship’s skin, or a nudge could knock the station out of its orbit.
The light-beam radar, which operates at a frequency of t
A. laser-doppler radar is more accurate than microwave radar
B. microwave radar may not ensure absolute precision in measuring varying speeds
C. the light-beam radar can measure only slow speeds with accuracy
D. microwave radar operates at a higher frequency than laser-doppler radar
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