我国检验检疫部门已对（）等类商品实施出口商品质量许可制度。

What is the main purpose of the passage?A．To guide people to survive fires. B．To provide safety advice. C．To please travelers. D．To give the information of airline industry statistics.

A.To
B.To
C.To
D.To

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Questions 6~10 are based on the following passage: According to the airline industry statistics, almost 90% of airline accidents are survivable or partially survivable. B ut passengers can increase their chances of survival by learning and following certain tips. Experts say that you should read and listen to safety instructions before takeoff and ask questions if you have uncertainties. You should fasten your seat belt low on your hips as tightly a s possible. Of course, you should also know how the release mechanism of your belt operates. D uring takeoffs and landings you are advised to keep your feet flat on the floor. Before takeoff you should locate the nearest exit and an alternative exit and cou nt the rows of seats between you and the exits so that you can find them in the dark if necessary. In the event that you are forewarned of a possible accident, you should put your hands on your ankles and keep your head down until the plane comes to a complete stop. If smoke is present in the cabin, you should keep your head low and cover your face with napkins, towels, or clothing. If possible, wet these for added protection against smoke inhalation. To evacuate as quickly as possible, follow crew commands and do not take personal belongings with you. Do not jump on escape slides before they are fully inflated, and when you jump, do so with your arms and legs extended in front of you. When you get to the ground, you should move away from the plane as quickl y as possible, and never smoke near the wreckage. According to the experts, when should travelers read and listen to safety instructions?A．Throughout the flight B．During landings C．Before takeoff D．In an emergency

A.Throughout
B.During
C.Before
D.In

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