下列说法中.正确的一项是( )
A:森林古猿演化为人类是在很短的时间内完成的
B:古人类语言的完善是在直立行走之前
C:“露西”时代的古人类能够使用工具,也能制造简单的工具
D:古人类使用火烧烤食物,有利于脑的发育
句型转换____ She often does her homework at night. (变为否定句)She her homework at night.____ We are cleaning our classroom now. (对划线部分提问) you now?____ He likes pandas because they are very cute. (对划线部分提问) he pandas?____ I think he is in the classroom.(改为否定句)I think he in the classroom.____ Mr Black is a doctor.(对划线部分提问) Mr Black ?
在某新型材料的研制中,实验人员获得了如下一组实验数据:现准备下列四个函数中的一个近似地表示这些数据的规律,其中最接近的一个是( )
X
1.99
3
4
5.1
6.12
Y
1.5
4.04
7.5
12
18.01
Snowfall and low temperatures haven't made the animals move hurriedly for shelter. _______, they greet the snow with excitement, either enjoying the snowy landscape or tasting snowflakes.