下列关于用高倍镜观察人的口腔上皮细胞线粒体的实验的说法，不正确的是（　　）

读加拿大地理位置图及人口、矿产等分布示意图。回答下列问题。

湖南路大桥于今年5月1日竣工，为徒骇河景区增添了一道亮丽的风景线．某校数学兴趣小组用测量仪器测量该大桥的桥塔高度，在距桥塔AB底部50米的C处，测得桥塔顶部A的仰角为41.5°（如图）．已知测量仪器CD的高度为1米，则桥塔AB的高度约为（　　）（参考数据：sin41.5°≈0.663，cos41.5°≈0.749，tan41.5°≈0.885）

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    It's a rainy Saturday. Mary and her family are spending the afternoon at home. Her uncle and aunt are visiting them.

    Mary's father, Mr Harris, and her uncle and aunt are in the living room. Her father is drawing a picture and her uncle and aunt are watching the news on TV. They are also talking.

    Mary's elder brother, Peter, is in his bedroom playing computer games. He is a computer fan and he spends much time playing on the computer. His younger brother, Jim, is also in the living room. He is playing with his model cars.

    Mary's mother, Mrs Harris, is in the kitchen preparing food for all of them. She is making some hamburgers and orange juice.

    Mary is talking to her friends, Lucy and Tom. They are from another town and want to draw pictures and play with Mary.

    Fluffy, the family cat, is sleeping on the kitchen's sofa. He is a lazy cat. Fluffy eats a lot, and he is a really fat cat.

回答下面5个问题，每题答案不超过8个词。