用科学记数法表示59 230 000正确的是( )
A:5.923×107
B:5.923×104
C:5.923×106
D:5923×104
分子式为C5H10O2的有机物在酸性条件下可水解为酸和醇,若不考虑立体异构,这些酸和醇重新组合可形成的酯共有( )
—It ________be her. Because I saw her go home a moment ago.
用适当的介词填空
What do you like doing ____the evening?
Thanks ____ your letter.
Look ________ the blackboard and listen____me.
We begin classes ____ about 8:00.