汽车沿平直公路从甲地开往乙地，两地相距90km，开始时汽车以10m/s的速度行驶了1.5h，然后余下的路程要在45min内匀速行驶完，求：后来汽车应以多大的速度行驶？

将左右两部分搭配，使其成为通顺的句子。

①Is she in the study?____   A. It's on the desk.

②Is this your bedroom?____   B. No, they aren't.

③Where's my pen?____    C. No, it isn't.

④Are they on the chair?____   D. Yes, she is.

⑤Where are my books?____    E. They are on the bed.

$\frac{5}{8}$ 这个分数中，____是分子，____是分母，读作____。