题目内容
（请给出正确答案）
Keep this reference book; it may come in ______ one day.
A．handy
B．useful
C．convenient
D．helpful
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更多“Keep this reference book; it may come in ______ one day.A．handyB．usefulC．convenientD．helpf”相关的问题
She did not know whether to sell her books or______.
A．to keep them for reference
B．keeping them for reference
C．if she should keep them for reference
D．to be kept for reference
She did not know whether to sell her books or______.
A．to keep them for reference
B．keeping them for reference
C．if she should keep them for reference
D．to be kept for reference
Keep this reference book; it may come in ______ one day.[2008]
A．handy
B．useful
C．convenient
D．helpful
A.reference
B.preference
C.purpose
D.function
A. Controlled copy
B. Keep File
C. Original
D. Reference Book Stam
Part A
You are to write a composition about How to Keep Healthy. You should write an essay of about 150 words making reference to the following points:
1) physical exercises;
2) food;
3) habit.
______ safety, you must keep all medicines away from children.
A．For the sake of
B．In the event of
C．On account of
D．With reference to
Keep in mind this important point in reference to your vocabulary improvement program. If you can personalize your new words, if you can make them bear some relationship to yourself and your way of living, you then materially increase your chances of making these words a permanent part of your vocabulary.
You cannot learn words in a vacuum. That is, if a word cannot be made to have a bearing on your life, if it cannot be brought within the circle of your own thoughts, if it cannot be made a part of your own personality or of your attitudes, then that word will remain useless to you.
Inertial guidance systems are used today in airplanes, submarines, and spacecraft. They display for the pilot his pitch, roll and yaw angles, his heading, his speed, and his latitude and longitude. These are very important items to have readily available, whether one is in a high speed vehicle with very low visibility due to poor weather, or in a spacecraft traveling in lunar orbit. The main features of inertial systems are that they are automatic and do not require any external information. Thus, the pilot does not have to feed in any information except the original position and altitude. Inertial systems serve a need on fast moving vehicles moving in a three dimensional plane, where position information is required by the pilot almost constantly.
It can be interred from the article that an inertial guidance system is similar to
A．a gyroscope.
B．a high speed vehicle.
C．a navigator.
D．a submarine.
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