30.What doabo the inlence of vegetables on depression
A.They prove better than fruits
B.Researchers have got no related proof
C.They are the key to treating depression.
D.Cooking them influences mental health.
31.What might be talked about in the following paragraph
A.Expring the ore methods of cooking vegetables.
B.Deseribing different fruits recommended by the doctor.
CFurther discussing why fruits could deerease depression.
D.Explaining how vegetables damage nutrients in the foods.
D
Heat waves don't just make bumblebees (hot.High temperatures also seem to
seriously reduce their sense of smell,which can be very bad for their survival.For
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bumblebees,being able to smell flowers is a matter of life or death because it helps them find
food.
Bumblebees are already known to suffer from climate change.So,a researcher from the
University of Wurzburg in Germany and her team wanted to understand if heat waves could
influence bumblebees'ability to smell flowers.
The researchers put around 190 bumblebees from two common species into small special
rooms for almost three hours at temperatures of 40C to simulate (heat waves.Some
bumblebees were also put in a dry environment;some had ways to sugary resources;some
were given time to recover at normal temperatures for 24 hours after the heat treatment.
After the simulated heat waves,the researchers cut off the bumblebees'antennae ()
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which they use to smell,and measured whether the olfactory sensory neurons (the cells that
help them smell)in the antennae could still detect flower scents.
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The heat waves reduced the bumblebees'ability to smell by up to 80 percent.Worker
bumblebees,which are all female,were more affected than male bumblebees.Even worse,
the antennae of the bumblebees that had 24 hours to cool off still didn't recover their sense of
smell after that time."That was surprising,"said the researcher.This suggests the
bumblebees don't recover quickly,which means they might have trouble finding food."It
could be one reason why we see so many bumblebee's population drops,"she added,along
with other factors like habitat loss.
"The study seems pretty reliable,said a bumblebee ecologist from the University of
Sussex in Brighton,England,who didn't take part in the study."The antennae are quite
similar across bee species,he added."fbumblebees suffer in this way,I think it's probable
that other bees would tooBut weonkw for ure m does research on t.
32.What problem might bumblebees face in the end because of heat waves
A.Death risk.
B.Habitat loss.
C.Food shortage.
D.Sensory failure.
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