题目内容：
Topic Sentence (主题句)is ( )(本题1.0分)A、 According to airline industry statistics, almost 90% of airline accidents are survivable or partially survivable.
B、 But passengers can increase their chances of survival by learning and following certain tips.
C、 Experts say that you should read and listen to safety instructions before takeoff and ask questions if you have uncertainties.
D、 You should fasten your seat belt low on your hips and as tightly as possible.
E、 Of course, you should also know how the release mechanism of your belt operates.
F、 During takeoffs and landings you are advised to keep your feet flat on the floor.
G、 Before takeoff you should locate the nearest exit and an alternative exit and count the rows of seats between you and the exits so that you can find them in the dark if necessary.
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