Scientists have found that electrocardiogram signals from different people’s pulses are not the same，3.meaning (mean) that heartbeats can be used in security systems to identify different people.

　　In the study，Lin 4.took (take) a subject’s electrocardiogram reading twice，once from each hand.From these two readings，Lin determined the special properties of his or her heartbeats and stored 5.them in a computer.This then became his or her unique password for entering the computer.

　　Lin believes that the pulse rate system will be popular because it is much safer than fingerprint 6.recognition (recognize) systems，some of 7.which can be “tricked” with a photograph of someone else’s finger.

　　The new system is also said to be more convenient.Instead of typing in a series of complicated numbers and letters every time，you 8.simply (simple) need to touch the computer to log in.This may help put 9.an end to the panic of not being able to start up a computer 10.because/for/as/since you’ve forgotten your password.

　　B

　　The only survivor of a shipwreck was washed up on a small and an uninhabited island.He prayed to God for rescuing him，and every day he scanned the horizon for help，but 1.none seemed forthcoming.

　　2．Exhausted (exhaust)，he eventually managed to build a little hut out of driftwood to protect him 3.from the elements，and to store his few possessions.But then one day，after searching for food，he arrived home only 4.to_find (find) his little hut in flames，the smoke rolling up to the sky.

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