m和z一定时，分度圆是一个大小唯一确定的圆。
A. 对
B. 错
Sputnik, the first satellite in space, weighed less than a refrigerator
A. less than 85 kilograms(190 pounds)
B. less than 170 kilograms(370 pounds)
The number of people in space right now can be counted on one hand
A. 5 or less
B. more than 5
The Hubble Telescope is about as long as a school bus
A. 13 meters(40 feet)
B. about 25 meters (80 feet)
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