直立行走使古人类能 [ ]
A．扩大活动范围
B．便于手肢行走
C．使前肢解放，便于使用工具
D．便于从树上摘果实
答案：C
下面每句中A，B，C，D四项有一项是错误的，请指出并在后面的横线上改正。
( ) 1. How heavyer are you?
A B C D
( ) 2. Look! The monkeys are eat bananas.
( ) 3. These are my shirts. It's mine.
( ) 4. That's a jacket. It's brown jacket.
( ) 5. —Are everyone here now? —No, Jim and Tom aren't here.
( ) 6. A man behind the tree is my mother's brother.
实验室里有下列四种量筒，分别标有最大量程和分度值，为了一次并能较准确测出质量为100 g、密度为0.8×103kg/m3的酒精，应选用的量筒是（ ）
A．500mL，10mL
B．100mL，2mL
C．250mL，5mL
D．50mL，1mL
