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问题 选择题

People think "SOS" is the simplest and common _____ to make, in time of danger or disaster. [ ]

A. mark

B. sign

C. signal

D. remark

答案

答案：C

单项选择题

Rapid application development (RAD) systems purport to lighten the developer’s (46) by making it easy to program an application with simple intuitive steps.
RAD tools (47) the developer everything needed to construct a fully functional application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools should be able to (50) on new features with little fuss.

A. appearances B. emergesC. recognizes D. solves
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多项选择题

电解制氯间内必须设置（）等安全警示标志。

A、严禁烟火

B、剧毒危险

C、当心中毒

D、易燃易爆危险

E、当心腐蚀
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