问题
单项选择题
肾实质不显影常见于哪种疾病（）
A.肾功能减退
B.尿路梗阻
C.肾结核
D.肾脓肿
E.肾血管性病变
答案
参考答案：E
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肾实质不显影常见于哪种疾病（）
A.肾功能减退
B.尿路梗阻
C.肾结核
D.肾脓肿
E.肾血管性病变
参考答案：E
Directions: There are 10 blanks in the following passage. For each numbered blank, there are four choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.
| Our planet is like a bit spaceship. Our atmosphere acts (51) a shield against harmful radiation and space debris. (52) holds the air and people on the spaceship, (53) everything doesn’t float away. Each of us is an astronaut and our spaceship, the earth, provides our food and water. The sun is our energy (54) and without it we would not be able to survive. (55) every spaceship, the earth is a closed system. The only thing we receive from the outside is energy from the sun. Everything else must be used (56) again. We astronauts don’t seem to realize that this spaceship is the (57) one we’ve got. We (58) its resources and waste the energy the plants have stored from the sun. If we (59) our spaceship, we will destroy ourselves as well. Maybe if we look at the universe which surrounds us, we will appreciate our own spaceship more and take (60) care of it. |
A．good
B．well
C．better
D．more