【单选题】Part A Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points) It is known that the brain shrinks as the body ages, but the effects on men...
A.
Brains of the more-educated people may become more contracted when they get aged
B.
Education may do harm to people's brains
C.
More educated people may suffer from brain tissue loss
D.
The less educated can resort to more cognitive reserves when aged
【简答题】在探究“斜面的机械效率高低与斜面的倾斜程度有什么关系”的实验中,用沿斜面向上的力F拉动小车,使小车从斜面底端匀速运动到斜面顶端,如图所示。多次改变斜面倾斜程度,部分实验数据记录在下面的表格中,根据表格中数据回答下列问题:(5分) 斜面 倾斜度 小车重量 G /N 斜面高度 h /m 沿斜面拉力 F /N 斜面长 S /m 有用功 W 有 /J 总功 W 总 /J 斜面的 机械效率 较缓 10 0....