患儿，男性，4岁，因"双眼交替向内偏斜1年余"就诊。患儿家长诉约1年半前开始发现患儿双眼交替向内偏斜，左眼较明显，偶尔也出现右眼偏斜。角膜映光法习惯右眼注视，左眼反光点位于颞侧瞳孔缘，左眼注视情况类似。遮盖试验均可见非遮盖眼眼球由内向外运动。眼球运动基本正常。
若此患儿戴镜下用三棱镜消除水平方向转动后，遮盖去遮盖检查发现去遮盖后双眼均存在小度数缓慢下转，下列哪些说法是正确的（）
A.行遮盖试验可发现被遮盖时双眼均存在小度数缓慢上转
B.嘱患儿头向一侧倾斜，可发现同侧眼上斜加重
C.因常引起复视，所以需要尽早手术治疗
D.若此患儿平时无明显的上斜现象，只在检查时出现小度数交替上斜，可以行单纯内斜视矫正术
E.病因是上斜肌麻痹，所以最适合的术式为下斜肌缩短术
参考答案：A, D
| 阅读理解。 |
| When you run downhill, gravity pulls you. When you throw a ball up, gravity pulls it down. When you sit, gravity holds you down. When you lie down, gravity holds you to the bed. We know gravity is everywhere even though we can't see it.We know it pulls on every stone and every drop of water. It pulls on everything. The gravity of the earth pulls everything towards the center of the earth.You know this when you try to lift a heavy stone. Gravity pulls it down. The more the stone weights, the more gravity pulls on it. To lift the stone, you must pull up harder than gravity pulls down. The earth has gravity and the moon also has gravity. The moon has less gravity than the earth has. This means the moon's gravity does not pull as hard as the earth's gravity. Do you weigh 60 kilograms? That means the pull of the earth's gravity on you is 60 kilograms. If you were on the moon, you would weigh only 10 kilograms. The pull of the moon's gravity on you would be only 10 kilograms. |
| 1. The word "gravity" in the passage means "______" in Chinese. |
[ ] |
A. 物体质量 |
| 2. Gravity ______. |
[ ] |
| A. pulls on everything high up B. is everywhere C. can be seen everywhere D. pushes on everything |
| 3. You can't lift up a big stone because ______. |
[ ] |
| A. more gravity pulls it down B. you don't know how to do it C. you are not strong D. gravity is out of the stone |
| 4. If you weigh 50 kilograms, that means ______. |
[ ] |
| A. you can lift up 50 kilograms of things B. the earth's gravity on you is less than 50 kilograms C. you can lift up more than 50 kilograms of things D. the earth's gravity on you is 50 kilograms |
| 5. If a stone weighs four kilograms on the moon, it weighs . |
[ ] |
| A. 10 B. 24 C. 40 D. 60 |