[单项选择]I wonder why you won’t do it as ______．It’s the third time you have done so．
A. told to
B. be told
C. told you D．you told

[单项选择]Did you ever wonder why you see the colors you do or if other animals see the same colors that you see We see light that bounces off of things around us. When the light enters our eyes, special cells tell our brains about the light. These cells are called photoreceptors. Light is made of little bits called photons. When the sun shines, trillions and trillions of these little bits of light fall on the earth. The photons bounce off of almost everything and some of them enter our eyes. Those bits that enter our eyes allow us to see. So, where does the color come from Starting in the 1600s with Sir Isaac Newton, scientists have believed that there are different kinds of photons. Different types give rise to our sense of colors. The different photons are said to have different wavelengths. Sunlight contains all the different wavelengths of photons. The visible wavelength colors can be seen when you look at a rainbow. Raindrops acting as natural prisms produce the colors.
A. Red, white, and blue.
B. Red, green, and yellow.
C. Red, green, violet.
D. Red, green, blue.

[单项选择]I often wonder why some people won’t do what it （　） to be successful.
A. involves
B. means
C. takes
D. likes

[填空题]Many people wonder why some men want to live on the moon. It is (1) not the kind of place where most men would choose to live. But man has always moved to new areas.
Some scientists hope that continued work will be done on the moon. Many experiments will be done there more (2) . Some large (3) are very easy to do in a place without air. Matter can be heated to very high temperatures without (4) change when it is in such a place. Air, dust, and clouds cannot (5) man’s view of space from the moon. The very high or very low temperatures and low gravity on the moon will be used for many experiments. One very important use of the moon will be to (6) spaceship.
Man might be able to learn much about his own body by living on the moon. He would be living in a habitat that he made for himself. Man would be in control of the (7) of life in which he lives. (8) could be removed from the air in this