1 . Yuan ________ the answer could be found in the creation of hybrid rice. A hybrid is a cross between two or ________ . One characteristic of hybrids is that they usually ________ crops. However, whether it was possible to develop a hybrid of self-pollinating plants such as rice was ________ .（根据课文内容填空）
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11-12高二下·福建福州·期末
2 . Long marks on the street_______ that the driver had attempted to brake.
| A．applied | B．attained C .indicated | C．distinguished |
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