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同类题1

由基因型为的个体产生的1000个精子中,有的精子500个,则理论上初级精母细胞中发生交换的比例是 (   )

同类题2

下列事件中导致西周灭亡的是(    )

同类题3

根据短文理解,选择正确答案。

    Last week, Richard's wife Leila had an accident. Richard's youngest child, John, was at home when it happened. He was playing with his new toy car. Richard gave it to him a week ago, for his third birthday

    Suddenly John heard his mother calling "Help! Help!" He ran to the kitchen. His mother burned herself with some hot cooking oil (油). She was crying and the pan (锅) was on fire.

    Richard went to his office. Both the other children went to school. John was too small to help his mother. ______. She soon put out the fire and took Leila to the hospital. When Richard came, Leila told him what happened. He was very proud(骄傲的,自豪的) of his son. "When you are a man, you will be just like your father," he said.

同类题4

如图所示的四种情况中,符合安全用电要求的是(  )

同类题5

给划线字标调

巍峨(wei)

蜿蜒(wan yan)

碧波万顷(qing)

____

____

____

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