问题
选择题
下列结构属于动物体细胞中能量转换器的是[ ]
A．细胞核
B．线粒体
C．叶绿体
D．叶绿体和线粒体
答案
答案：B
搜题请搜索小程序“爱下问搜题”
下列结构属于动物体细胞中能量转换器的是[ ]
A．细胞核
B．线粒体
C．叶绿体
D．叶绿体和线粒体
答案：B
| 完形填空。 | ||||
| Do you know how to study better and make your study more effective? We all know that Chinese students usually study very hard for a long 1 . This is very good, but it doesn't 2 a lot, for an effective student must have enough sleep, enough food and enough rest and exercise. Every day you need to go out for a walk or visit some friends or some nice places. It's good for your studies. When you return 3 your studies, your mind will be refreshed and you will learn more 4 study better. Psychologists (心理学家) 5 is that learning takes place this way. Here take English learning 6 an example. First you make a lot of progress and you feel happy, and then your language study seems 7 the same, so you will think you're learning 8 and you may give up. This can last for days or even weeks, yet you needn't give up. At this point your language study will again take another big 9 . You'll see that you really have been learning all along. If you get enough sleep, food, rest and exercise, learning English can be very effective and 10 . Don't give up along the way. Learn slowly and you're sure to get a good result. | ||||
|