题目

下列各项中正确描述水分在无机环境中和生物界中的循环途径的是（） A . 大气→植物叶片→植物根系→大气 B . 大气→一自然降水→植物根系→植物茎叶→大气 C . 植物叶片→植物根系→大气 D . 自然降水→植物茎、叶→植物根系→大气 答案：B    If you ask some people, “How did you learn English so well?” You may get a surprising answer, “In my sleep!”     These are people who have taken part in one of the recent experiments to test “Learn- While-Sleep’ methods, which are now being tried in several countries, and with several subjects, of which English is only one.     Specialists say that this sleep- study method speeds language learning greatly. They say that the average person can learn two or three times as much during sleep as in the same period during the day and this doesn’t affect his rest in any way. A word of warning, however, sleep-teaching will only strengthen in your mind what you have studied already while you are awake.     In the experiment, lessons were broadcast over the radio. Each lesson lasted twelve hours, from 8 p. m to 8. a. m.. The first three hours of English grammar and vocabulary were given with the student awake. At 11 p.m. a lullaby was broadcast to a sharp noise was sent over the radio to wake the sleeping student up for a few minutes to review the lesson. The soft songs sent him back to rest again while the radio went on. At 5. a. m. his sleep ended and he had to go through the lesson again for three hours before breakfast. 1. Compared with other methods of learning, the Learn- While- Sleep method is________. A．slower B．quicker C．very simple D．very tiring 2. By this method, one________. A．starts to learn a new lesson in sleep B．learns how to sleep better C．is made to remember his lessons in sleep D．can get more knowledge over the radio. 3. In the experiment the first part of the lesson was given________. A．around midnight B．after lullabies were broadcast C．while the student was awake D．all through the twelve hours 4. Before each lesson finishes, the student has to________. A．get up and take breakfast. B．be wakened by a loud noise C．listen to the lesson again in sleep D．review the lesson by himself 5. The Sleep- Study method is being tried in many countries to teach________. A．English B．grammar and vocabulary C．a number of subjects D．languages