随着地壳下沉，沉积物埋藏深度加深，有机质经受的温度和压力将大大增加。
参考答案：对
阅读理解，判断正(T)误(F)。
Amy: I have two story-books.
Mike: Where are they?
Amy: Guess.
Mike: Are they in your bag?
Amy: No, they aren't.
Mike: Are they on the desk?
Amy: Aha! They are under your chair.
( ) 1. Amy has two story-books.
( ) 2. The books are in the bag.
( ) 3. They are not on the desk.
( ) 4. Mike can't find books.
( ) 5. Books are under Mike's chair.
关于加速度与速度的关系，下列说法正确的是（）
A.加速度越大，速度一定越大
B.速度改变量越大，加速度一定越大
C.速度不变，加速度一定为零
D.速度为零，加速度一定为零
