题干

发射同步卫星与地球自转线速度密切相关,据此分析,下列发射场中最有利发射卫星的是( )

A:西昌

B:太原

C:酒泉

D:海南文昌

上一题 下一题 0.0难度 选择题 更新时间:2014-11-25 06:39:24

答案(点此获取答案解析)

D

同类题1

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

    A businessman, with a lot of money, was walking through a remote(偏远的) area. Upon1 this, a thief followed him, planning to2 his money at a certain time. The businessman(商人) noticed something was 3 and he started to pay much more 4to the thief.

    The businessman asked the thief if he5help find some water nearby, and when the thief went to6 the water, the businessman put all of his7into the thief's bag. Then the thief returned and told the businessman8the water was.9the businessman left to get some water, the thief quickly 10 the businessman's bag. Certainly, there was nothing that the thief 11

    The thief was12 but he still did not give up hope. After some time, the businessman returned and they both 13for a long time. Then the businessman got tired and 14 under a big tree. The thief again checked the businessman's bag and still did not find any money. So the thief 15 that the businessman did not actually have any money with him.

    Finally, they arrived at a city. When the thief went after a job and left his own bag behind, the businessman 16 in and took back all of his own money he had put there17When the thief came back, he was surprised to see that the businessman was 18some jewels with the money in his bag. The thief couldn't 19asking the question, “I didn't know you had money on the 20.” The businessman smiled to him, “Of course you didn't, because it is not yours.”

同类题3

阅读理解。

阅读下列短文,从每题所给的四个选项 (A 、B 、C  和 D )中,选出最佳选项。

    My friend Jennie Crossen gave her bone marrow (骨髓) to a 51-year-old woman with leukemia, a woman she has never met.

    At the end of March, the Red Cross called back. Six different blood elements were tested; Jennie matched five completely and was about a 3/4 match of the sixth. So she was the best match.

    In April, Jennie went for a complete physical exam by one of the doctors who would perform the surgery. The doctor had to make sure that it would be no threat to her. The doctor told her that the surgery would entail having two quarts of bone marrow extracted from her hip bones. Jennie would probably be released the same day the surgery took place and should expect to be sore for a couple of months.

    "I didn't think it was that big a deal until I realized I was a match," Jennie said, "There wasn't a question in my head. It didn't seem like something that was going above and beyond."

    Jennie was left with two very small scars on her lower back from the surgery and was given medication to help dull the pain. She still felt a great deal of pressure on her lower back. "Being only 21, I feel like I am not old enough to significantly impact someone's life," Jennie said, "It seems strange to me that I could possibly save this woman's life which was being cut short by cancer."

    Three weeks after the surgery, Jennie received a call from the Red Cross representative who told her the transplant was successful. "I feel good, and I think it will actually work for her," she said, "So many people say they'd only donate if it was for a family member or close friend. This woman is someone's family and someone's friend. Obviously, no one she knows is a match, and the fact that you'd be able to help a perfect stranger is great."