1.Most homes in the northern United States have roofs made w

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1.Most homes in the northern United States have roofs made with steep angles.In the warmer areas of the southern states.homes often have flat roofs.Make a conjecture about why the roofs are different.

2.Each spring.Rachel starts sneezing when the pear trees on her street blossom.She reasons that she is allergic to pear trees.Find a couterexaple to Rachel's conjecture.

优质解答：

1.The climate in northern United States are wet and windy,roofs made with steep angles can prevent the family from the rain and wind.While the climate in southern area is just opposite,so they prefer flat ones.

2.Some trees blossom on her street in autumn,but she didn't sneezing.

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