Question

Bicycle lights may not exactly be a problem that needs solving, but the following can be said about most of them ---- they’re easily stolen if left on an unattended bike. People riding at dusk can forget to turn them on, and those same people can forget to turn them off when they reach their destination. Well, the makers of the Blink/ Steady Bike Light have set out to address all of those shortcomings.

The waterproof(防水的) Blink/ Steady is so far only available as a tail light, although a head light is on the way. It’s fixed onto the bike’s seat post. A built- in photosensor(感光器) tells when it’s become dark enough for the light to be required, and allows it to come on once you begin the riding. According to the producers, it isn’t fooled by things such as headlights or streetlights. The light also contains an accelerometer, also known as a motion sensor, which can tell when the bike is in motion.

Between the two sensors, this means the light will come on only once it’s dark enough, and the bike is moving. Even when stopped at red lights, the small movements of the rider will reportedly be enough to keep the light activated---- it’ll go out after 30 seconds of complete inactivity. While this does mean that the two sensors are continuously powered up, they go into a very low---- power sleep pattern when the bike is sitting, unused.

Light is provided by two5- watt LEDs, seeable over a range of 180 degrees. And power comes from two AAA batteries, which provided up to 200 hours of continuous run time. The designers and engineers behind the Blink/ Steady are now raising money for its commercial production. About US $95 will get you one if they become available.

1.The first paragraph is mainly to mean that______.

A. bicycle lights are worth a research

B. bicycle lights are not a problem at all

C. bicycle lights are easy to deal with

D. bicycle lights are difficult to turn off

2.According to the text, the Blink/Steady Bike Light is sensitive to______.

A. the weather       B. streetlights      C. headlights      D. natural light

3.Why is there an accelerometer in the Blink/ Steady Bike Light?

A. To protect the bike against water.

B. To tell if the bike is moving.

C. To make the bike easy to ride.

D. To judge the speed of the bike.

4.What can be inferred about the Blink/ Steady Bike Light?

A. It will be turned off immediately if the bike stops.

B. The traffic lights have no effect on the light.

C. It won’t use any power if the bike is unused.

D. It must meet two requirements if it comes on.

 

Answer 1

【答案】

 

1.A

2.D

3.B

4.D

【解析】

試題分析：文章關(guān)注自行車車燈的問題。自行車車燈雖不像汽車車燈那樣，是一個小問題，但也值得研究。文章介紹了一種自行車車燈的工作原理。

1.根據(jù)第一段第一行“Bicycle lights may not exactly be a problem that needs solving, but the following can be said about most of them”可知，自行車車燈雖然不是一個太大的問題，但也值得研究。故選A。

2.根據(jù)第二段“when it’s become dark enough for the light to be required”和“it isn’t fooled by things such as headlights or streetlights”可知，這種車燈會自己判斷黑暗的程度來確定是否需要打開車燈，不會受到汽車前燈和路燈的影響。故選D。

3.根據(jù)第二段最后一句“The light also contains an accelerometer, also known as a motion sensor, which can tell when the bike is in motion.”可知，accelerometer是用來判斷自行車是否在行駛。故選B。

4.根據(jù)第三段“Between the two sensors, this means the light will come on only once it’s dark enough, and the bike is moving.”可知，只有天足夠黑，自行車在運轉(zhuǎn)的時候，車燈才會亮。故選D。

考點：科技類短文閱讀