预警信号一般采用国际通用的颜色表示不同的安全状况，按照事故的严重性和紧急程度，以颜色进行标识，其中代表安全的是()。
A. 蓝色
B. 黄色
C. 橙色
D. 红色
E. 绿色
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Cash flows are grouped in the statement of cash flows into the following major categories:
A. cash receipts, cash disbursements, and noncash activities
B. direct cash flows and indirect cash flows
C. operating activities, investing activities, and collecting activities
D. operating activities, investing activities, and financing activities
Nathan Hale ______ by the British guards.
A. was hanged
B. was hung
C. hung
疾病的诊断和治疗方法不能取得专利权。()
A. 正确
B. 错误
A good reader may use the highest speed of reading when ______ .
A. he is trying to find materials for his report
B. he is trying to work out a maths problem
C. he reads the material most useful to him
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