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Certain portable electronic devices (PEDs) may interfere with aircraft navigational e quipment. PED use is permitted while on the ground when the boarding door is open, a nd in flight when advised by crew members. About 10 minutes before departure, passengers will be asked to turn off computers, cell phones and other PEDs. T he following PEDs are approved for use during the flight time: ？ Personal Computers ？ Handheld computer games ？ Personal stereo and video devices Medical devices are permitted at all times while TVs, radios, two-way radios, remote-control devices and some other electronic devices are not permitted. Due to safety concerns, the crew may at any time request that PEDs be turned off. Cell phones may be used only in the following instances: ？ When the aircraft is at the gate and the boarding door is open. ？ When the aircraft is on the ground away from the gate and the captain has approved their use.
What is the possible bad effect of using a PED on an aircraft in flight？ The aircraft navigational equipment may be ______.

that men are more likely than women to suffer major hair loss. Some kinds of hair loss are temporary (暂时的), an effect of illness. In those cases we can expect the hair to grow back.It all depends on whether the hair root is alive. If it is not, hair loss is permanent and nothing will help.
Some daily loss of hair is a normal, healthy sign. Most people lose between 40 to 50 scalp hairs each day.
Each of these scalp hairs grows for from two to six years and then rests. About three months later it is pushed out by a new hair growing from the same root. This is not something that should cause great concern.
Something else we know is that normal hair loss is seasonal(季节性的）, with the most hair loss occurring in the fall. Everyone experiences a normal cycle of loss and growth.
The problem of hair loss results when loss is greater than growth.
The main cause of hair loss in men seems to be accumulation (积累) of a hormone (荷尔蒙) in the body. When that hormone reaches a certain level, the hair growing period is shortened and hair loss is the result. There is no cure for most cases of hair loss. This, however, is not the end of the world.
According to science, _________.
A.all hair loss is a normal, healthy sign
B.man should pay special attention to hair loss
C.it’s likely that men have more problems of hair loss
D.men lose more hair than women do
If the hair root is not alive,_______.A.there will be illness
B.human beings have no way to cure hair loss
C.hair loss are temporary
D.there is still something that can help
We now know that the most hair loss happening in the autumn is ________.A.permanent
B.healthy sign
C.seasonal
D.nothing serious
The sentence “This, however, is not the end of the world ” means _______.A.man is sure to find the best way of curing his hair loss in the future
B.the writer believes the earth exists for ever
C.we can’t destroy the world by any means
D.the last day will never come to our people
The best title for the passage may be ________.A.Loss or Growth
B.Hair Loss
C.Healthy Sign
D.Change with Seasons