青春期男、女生体型各有特点,据此,女生在哪些能力方面占明显优势()
A.奔跑
B.跳跃
C.耐力
D.柔韧性
E.平衡能力
参考答案:D, E
下列各式中,计算正确的是( )
A.(x-2)(2+x)=x2-2
B.(x+2)(3x-2)=3x2-4
C.(ab-c)(ab+c)=a2b2-c2
D.(-x-y)(x+y)=x2-y2
My parents live in a small village. They always keep candles in the house __________ there is a power cut.
A.if
B.unless
C.in case
D.so that