练习:
A) Honeybees are flying all across the country.
C) Honeybees are leaving their hives and do not return.
2. Why are researchers seriously concerned with the phenomenon of colony-collapse disorder?
B) Because honeybees feed on flowers.
D) Both B and C.
A) Worsening environment.
C) Dwindling number of flowers around.
4. According to the fifth paragraph, which of the following about bees genes is true?
B) Bees genes help keep them in their hives.
D) Bees genes could explain the collapse of some colonies.
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