问题
选择题
下列说法正确的是（ ）
|
答案
A、
的平方根是±1 4
，原说法错误，故本选项错误；1 2
B、
的平方根是±1 4
，原说法错误，故本选项错误；1 2
C、
的立方根是1 8
，说法正确，故本选项正确；1 2
D、
的立方根是1 8
，原说法错误，故本选项错误；1 2
故选C．
搜题请搜索小程序“爱下问搜题”
下列说法正确的是（ ）
|
A、
的平方根是±1 4
，原说法错误，故本选项错误；1 2
B、
的平方根是±1 4
，原说法错误，故本选项错误；1 2
C、
的立方根是1 8
，说法正确，故本选项正确；1 2
D、
的立方根是1 8
，原说法错误，故本选项错误；1 2
故选C．
Directions: There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D.
| The key to the industrialization of space is the U.S. space shuttle. (51) it, astronauts will acquire a workhouse vehicle (52) of flying into space and returning many times. (53) by reusable rockets that can lift a load of 65 000 pounds, the shuttle will carry devices for scientific inquiry, as well as a variety of military hardware. (54) more significantly, it will deliver materials and machines into space for industrial purposes (55) two decades ago when "sputnik" (artificial satellite) was added to the vocabulary. In short, the (56) importance of the shuttle lies in its promise as an economic tool. What makes the space shuttle (57) is that it takes off like a rocket but lands like an air plane. (58) when it has accomplished its mission, it can be ready for (59) trip in about two weeks. The space shuttle, the world’s first true spaceship, is a magnificent step (60) making the impossible possible for the benefit and survival of man. |
A．new
B．another
C．certain
D．subsequent