与直肠癌发病无关的因素是 A．直肠腺瘤 B．饮食 C．痔 D．直肠慢性炎症 E．遗传
题型：单项选择题
问题：
与直肠癌发病无关的因素是
A．直肠腺瘤
B．饮食
C．痔
D．直肠慢性炎症
E．遗传因素
题型：单项选择题
| 选择最恰当的单词或词语完成短文。 |
 | Tourists in space Man has been traveling into space for more than 40 years. Even today though, very few people get the chance to be an astronaut, about 30 per year. This is mainly because of the expense. It costs millions of yuan to train and send astronauts into space. Very few countries can 1 this. |
| This is why American businessman Dennis Tito paid 20,000,000 US dollars to the Russian space agency to go into space. He visited the International Space Station. His 2 , making him the first ever space tourist, took eight days altogether. He spent most of his time taking photos, looking at the Earth and listening to music on his once-in-a-lifetime trip. After landing 3 back on earth, Mr. Tito thought the trip was worth the money. The only difficulty he had was walking but this is normal (正常) for anyone who's been in zero gravity (重力). Some people, especially in the American space agency, think that you must be 4 to go into space. They worry about the safety of other astronauts. However, Mr. Tito received training before he left. He also helped to prepare food for the others while in space. They told him what to do and where he was 5 to go. A survey showed that 75% of Americans supported space tourism. Some people are bored of all the places on earth. They are looking for a new 6 trip and space is the place. The money Mr. Tigo gave the Russians equaled 20% of their annual budget (年度预算). If we want to see men on Mars and other planets, we may need rich people 7 Mr. Tito to help us pay for it. The Russians have more rich people who want to become space tourists. They should take them. |
| ( )1. A) give ( )2. A) plan ( )3. A) heavily ( )4. A) international ( )5. A) allowed ( )6. A) developing ( )7. A) except | B) afford B) money B) easily B) traditional B) made B) surprising B) like | C) receive C) trip C) safely C) special C) noticed C) boring C) with | D) prove D) time D) hardly D) professional D) invited D) exciting D) from |