[填空题]Knowing something urgent had happened to his friend, the author joined his friend and rushed to the hospital immediately.

[填空题]Knowing something urgent had happened to his friend, the author joined his friend and rushed to the hospital immediately.

[单项选择]Then something happened to Cosmos. It may have sprung a small leak ; perhaps it struck a tiny asteroid (小行星) or a piece of debris. Nobody knows for sure, but for one reason or another. Cosmos drifted off course. T. S. Kelso, an aeronautics expert at Analytical Graphics. which provides satellite-tracking services to NASA, noticed that the orbits of Cosmos and Iridium were bringing the two satellites closer to each other all the time. In February he issued a waming that they would pass within a kilometer of one another. He was right. On Feb. 10, Motorola lost track of Iridium’s signal. Over the next few days, Kelso and others surmised (推测) that what many had feared for years had finally come to pass: two intact (完好无损的) satellites had collided head on.
What had happened to Cosmos and Iridium in February according to Kelso
A. They had had mechanical problems.
B. They had struck a tiny asteroid.
C. They has struck a piece of debris.
D. They had collided into each other.

[填空题]If we had had his telephone number, we (call) ______ him.

[填空题]King herod had his palace built at Masada because he wanted to stay away from the city.

[填空题]King Herod had his palace built at Masada because he wanted to stay away from the city.

[简答题]A child who has had his confidence really damaged basically needs a rescue operation.

[填空题]John went to town yesterday and had his computer (repair) _____.