不定项选择：不定项选择下列说法正确的是（） A．海市蜃楼是由于光的全反射造成的，成的是倒

不定项选择

下列说法正确的是（）

A．海市蜃楼是由于光的全反射造成的，成的是倒立的虚像

B．海市蜃楼是由于光的全反射造成的，成的是正立的虚像

C．沙漠中的蜃景是由于光的全反射造成的，成的是倒立的虚像

D．沙漠中的蜃景是由于光的全反射造成的，成的是正立的虚像

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参考答案：加涅根据学习情境由简单到复杂、学习水平由低级到高级的顺序，把学习分为八类，构成了一个完整的学习层级结构。依次是信号学习、刺激一反应学习、连锁学习、言语联结学习、辨别学习、概念学习、规则或...

完形填空
After the Second World War, there were many reports of mysterious "flying saucers (碟子)". They 1 throughout the world. For quite a long time strange shapes had been reported in. 2 parts of the world, but it was not until recent times that these were seriously studied. Pictures and films 3 of flying saucers, or UFOs seen in the sky. Some pilots of 4 reported that round flying machines had followed 5 , and moved at great speeds. Some unofficial (非官方的) experts and 6 suggested that some creatures(生物) from other planets were watching us. Some reports said a UFO had 7 the earth. A space creature 8 the UFO and moved around, then flew off again. But none of the landings was ever proved to be true. What lies ahead of us? We do not know. 9 we are sure that whatever happens, we are living in an age which will grow steadily 10 .
( )1. A. see ( )2. A. the same ( )3. A. take ( )4. A. planes ( )5. A. them ( )6. A. people ( )7. A. was ( )8. A. ran away ( )9. A. And ( )10. A. interesting	B. saw B. different B. took B. ships B. they B. teachers B. left B. came into B. But B. interested	C. were seen C. similar C. were taking C. space C. we C. TVs C. arrived C. got out of C. Or C. more interesting	D. seen D. alike D. were taken D. trains D. us D. newspapers D. landed on D. reached D. So D. more interested