What news event is reported？
A bomb threat at a hospital.
B. A flood at a school.
C. A fire at an apartment building.
D. A severe drought famine in a villag
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一条线路带宽为1 Mbps，往返时延为45 ms，假设数据帧的大小为1 000字节。若采用停一等协议，实际的数据率是()。
A. 15 Kbps
B. 1．5 Kbps
C. 151 Kbps
D. 1 510 Kbps
【B20】
A. shifts
B. transfer
C. jobs
D. class
The second paragraph implies that testing for anabolic steroids
A. is always accurate and reliable.
B. is proved to be inaccurate.
C. may sometimes show inaccuracy.
D. has helped end doping in sport.
What made this eclipse so unique？
A. Its location for viewing in the world.
B. Its timing on the calendar.
C. Its movement across the sky.
D. Its beautiful scen
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