题干

老师将两张刚制好的永久装片和两张写明“球形细菌”和“酵母菌”的标签交给你,请你借助光学显微镜正确地将标签贴好,你的依据是( )

A:叶绿体的有无

B:细胞核是否成形

C:细胞膜是否有

D:细胞壁的有无

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答案(点此获取答案解析)

B

同类题5

阅读理解

B

    One morning a boy went home with his father. They noticed a pair of old shoes by the roadside. They thought the shoes might be a poor man's. In fact, the owner of the shoes was working in the field nearby, and he had nearly finished his work.

    The boy said to his father, "Let's play a trick on the man—we hide his shoes, and wait to see what he will do when he can't find them."

    "My boy, we should never have fun by tricking other people like that," answered his father. "Instead, let's put a coin in each of the shoes, and watch he will do."

    The boy did so, and then they hid nearby.

    The man soon back to get h is shoes, but when he put his foot into one of his shoes, he felt something in it. He bent(弯曲)down and found the coin.

    Surprise appeared on his face. He looked at the coin for a minute, and then looked around, but nobody could be seen. He then went on to put on the other shoe, but he was even more surprised to find the second coin.

    He then went down on his knees, looked up to the sky and said thanks aloud. He said his wife was ill and his children were hungry. He wanted to buy some bread for them.

    The boy was deeply moved.

    "Now," said his father, "you must be much more pleased than if you had played your trick."

    The boy replied, "You have taught me a lesson which I'll never forget. Now I understand these words, which I didn't understand before: It is more blessed(神圣的)to give than to receive."