D．By making beds with branches.

　　70．Why will not birds fall when they are at rest?

　　       A．They build nests and sleep in them.       

　　B．They fall asleep automatically.

　　       C．They have a loose tendon in their legs  

　　D．They lock their feet around a branch.

　　71．What does the writer intend to tell us?

　　A．The cleverest animal is the gorilla because it can make beds.

　　B．Differences in habitat could lead to different living habits.

　　C．The ways animals catch their Zzz’s are pretty much the same.

　　D．In order to protect themselves most animals choose not to sleep.

　　E

　　Pollution is reducing the fragrance（芬芳） of plants and thus preventing bees from pollinating(授粉) them—endangering one of the most essential cycles of nature, a new study suggests.

　　The potentially hugely significant research, funded by US National Science Foundation, has found that gases mainly formed from the emissions（排放） of cars prevent flowers from attracting bees and other insects to pollinate them. And the scientists who have conducted the study fear that insects’ abilities to drive away enemies and attract mates may also be disturbed.

　　Professor Jose Fuentes, who led the study, said, “Scent molecules(香味分子) produced by flowers in a less polluted environment could travel for roughly 1,000 to 1,200 meters. But today they may travel only 200 to 300 meters. This makes it increasingly difficult for bees and other insects to locate the flowers.”

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