High-speed trains travel at 300 kilometers an hour，which is about normal trains．
| A．four times the speed as | B．the speed four times of |
| C．four times as the speed of | D．four times the speed of |
相关试题
Jack is late again. It is ________ of him to keep others waiting.
| A．normal | B．ordinary |
C．common | D．typical |
A cough is usually nothing to worry about unless it lasts for ten days ___.
| A．or more | B．instead | C．at most | D．only |
After the long journey, the three of them went back home, ______.
| A．hungry and tiredly | B．hungry and tired |
C．hungrily and tiredly | D．hungrily and tired |
As he works in a remote area, he visits his parents only__________.
| A．occasionally | B．anxiously | C．practically | D．urgently |
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