You can’t see things clearly through a telescope unless it is correctly ________to your sight.
A. Adjusted B. Examined C. Checked D. tested
高二英语单项填空中等难度题
You can’t see things clearly through a telescope unless it is _____ correctly to your sight.
A. adjusted B. examined C. checked D. tested
高二英语单项填空中等难度题查看答案及解析
. You can’t see things clearly through a telescope unless it is ________ correctly to your sight.
A. treated B. adopted C. adjusted D. reminded
高二英语单项填空简单题查看答案及解析
You can’t see things clearly through a telescope unless it is correctly ________to your sight.
A. Adjusted B. Examined C. Checked D. tested
高二英语单项填空中等难度题查看答案及解析
.You can’t see through the telescope until it ______ to your eyes.
A. contributed B. guaranteed good C. is similar D. is adjusted to
高二英语单项填空简单题查看答案及解析
(D)
You can not see any object unless light from that object gets into your eyes. Some of the things you see give off light of their own. The sun, the stars, a lighted lamp are examples that can be seen by their own light. Such things are luminous. Most of the things you see are not giving off light of their own. They are simply reflecting light that falls on them from the sun or some other luminous bodies. The moon, for example, does not give off any light of its own. It is non-luminous. You see it because sunlight falls on it and some of it reflects in our direction. So moon light is only second hand sunlight.
When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.
Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380 000 kilometers away, in only a little more than a second.
1.You can see the book because_______.
A．your eyes are close to it B．it reflects some of the sunlight
C．it has light of its own D．your eyesight can get to it
2.The underlined word “luminous” means_______.
A．visible B．all colors C．giving off light D．sunlight
3.________ have light of their own.
A．The sun and the moon B．The stars and the earth
C．The sun and the stars D．The moon and the earth
4.Which of the following is true?
A．All the things you can see give off light.
B．Light from the book is much shorter than that from the moon.
C．The moment you open your eyes the light from the book travels to your eyes.
D．Light travels so fast that there is no time for you to read.
5.This article is probably from _________ .
A．a science magazine B．a medical magazine
C．a biography D．a story book.
高二英语阅读理解中等难度题查看答案及解析
Would you please ______ the light ? I can’t see much clearly . It is getting dark .
A. switch off B. switch on C. turn off D. take on
高二英语单项填空中等难度题查看答案及解析
On a clear night, you can see a sky paced with stars. But you can’t see planets orbiting any of these stars, even with the strongest Earth—based telescopes. Astronomers reported that they discovered seven Earth—sized planets orbiting a nearby star called TRAPPIST – 1 in February. They had to rely on indirect evidence to tell them that the planets are there. By doing some math, they figured out the number of planets and the distance of their orbits.
TRAPPIST – 1 is a red dwarf （红矮星）, much smaller than our sun, but larger than Jupiter (木星). If the sun were the size of a basketball, TRAPPIST – 1would be the size of a gold ball. This star is one of our closest neighbors, just like the moon to the earth in space.
When astronomers using Earth-based telescopes to study TRAPPIST – 1,they noticed that every once in a while, it became slightly dim（昏暗）. They decided that a planet must be passing in front of the star, blocking part of the light. This dimming would come and go as the planet orbited the star, passing alternately (交替地) behind and in front of the star regularly.
By making careful observations, astronomers expected to get a rough idea of the planet’s size from the pattern of dimming light. But the light level changed often and not at evenly spaced (均匀间隔的) times. The astronomers had to conclude they were looking at more than one planet! To get additional data, NASA’s spritzer Space Telescope measured TRAPPIST –1’s brightness nearly continuously for 20 days, catching 34 crossings of planets in front of the star. Sorting through the mess of data, the astronomers found that the innermost planet completes its orbit in 1.5 Earth days, while the outermost planet takes 20 days. Once you know how long it takes each planet to complete an orbit, you can work out how far it is from the star compared with the other planets.
The TRAPPIST – 1 planets are not alone. So far, astronomers have found more than 3,400 planets that orbit other stars.
1.How did astronomers know the number of planets orbiting TRAPPIST –1?
A. They used their eyes. B. They used telescopes.
C. They performed some calculation. D. They made some guess.
2.How does the author introduce TRAPPIST – 1 in paragraph 2?
A. By giving examples. B. By making comparisons.
C. By providing research results. D. By listing some numbers.
3.What probably causes the star TRAPPIST – 1 to be slightly dim?
A. The telescope’s failure. B. The cloud floating around.
C. The star’s moving. D. The passing planets.
4.What’s the main idea of Paragraph 4?
A. The ways to get the information of the planets.
B. The introduction of the planets.
C. The distances of the planets to the star.
D. The astronomers’ effort of exploring TRAPPIST – 1.
高二英语阅读理解中等难度题查看答案及解析
----I can’t see the words on the blackboard clearly.
----Why, your eyes need _____. Perhaps you need ______ glasses.
A. examining; wearing B. to examine; wearing
C. to be examined; to wear D. examined; wearing
高二英语单项填空中等难度题查看答案及解析
You can see the stars on a clear night, but in the daytime they are _____
A. unbelievable B. invisible C. inaccessible D. unavailable
高二英语单项填空简单题查看答案及解析
You can see the stars on a clear night, but in the daytime they are __________.
A. unbelievable B. invisible C. inaccessible D. unavailable
高二英语单项填空简单题查看答案及解析