[单项选择]选择仪表测定值范围应在（）处。
A. 1/2
B. 2/3
C. 末端

Studies of whales in captivity (囚禁；被拘留的状态) have taught us much about their physiology (生理学) as well as their complex social behavior. Their learning and problem-solving skills, together with their curiosity and often eager interactions with humans, have led some scientists to believe that whales possess a high level of intelligence.
The large brains of whales also suggest a high intelligence. The sperm whale (抹香鲸)’s brain is considerably larger than an elephant’s, brain and six times the size of a human brain. However, relative to the rest of the body, a sperm whale’s brain is only about 0.02 percent of its body weight, while a human brain is about 2 percent. These animals tend to rely on hearing more than vision, which explains why the visual centers of their brains are smaller proportionally than those in humans. Another feature is the degree of folding of the upper surface of the brain. This folding increases the surface area and has been obse
A. The first stage of a multistage rocket consists of rocket engines that provide a large amount of force.
B. The first stage lifts the entire launch vehicle off the launch pad and into the first part of the flight.
C. After its engines use up its fuel, the first stage part of the rocket separates from the rest of the launch vehicle and falls to the space.
D. The entire launch vehicle includes its load of fuel, the rocket body, and the satellite.