The ________ runner can run 2 miles in fifteen minutes.

中国大学MOOC: The city sits on a hilltop and, like the country of Chile, is _______ like a toothpick - just 2 miles wide but 40 miles long.

A．At least 14 miles an hour.B．At least 40 miles an hour.C．At most 40 miles an hour.D．A A: At least 14 miles an hour. B: At least 40 miles an hour. C: At most 40 miles an hour. D: At most 14 miles an hour.

How long is the Great Wall of China? () A: 500 miles B: 1,500 miles C: 5,000 miles

It reached a speed of forty miles an hour. It ________ forty miles an hour.

According to the information given in Paragraph 5, we can conclude that the distance between the earth and the moon is approximately__________. A: 186,000 miles B: 372,000 miles C: 11 billion light years D: 2 billion light years

An ______ runner can run 2 miles in fifteen minutes. A: common B: usual C: average D: general

3. The local people live miles and miles away from each other.

The trip was 40 miles. The speed for the first y miles was x, and the speed for the remaining trip was 1.2x. What is the average speed (1)x=12 miles per hour (2)y=20 miles A: 条件(1)充分，但条件(2)不充分． B: 条件(2)充分，但条件(1)不充分． C: 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． D: 条件(1)充分，条件(2)也充分． E: (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

The trip was 40 miles. The speed for the first y miles was x, and the speed for the remaining trip was 1.2x. What is the average speed（）(1)x=12 miles per hour(2)y=20 miles A: 条件(1)充分，但条件(2)不充分． B: 条件(2)充分，但条件(1)不充分． C: 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． D: 条件(1)充分，条件(2)也充分． E: 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分