如果显微镜的放大倍数为5×,目镜放大倍数为10×,则物像放大倍数是( ) A.5

题型:选择题

问题:

如果显微镜的放大倍数为5×,目镜放大倍数为10×,则物像放大倍数是(  )

A.5

B.10

C.500

D.50

考点:显微镜的构造和使用
题型:选择题

某商品一件的成本为30元,在某段时间内,若以每件x元出售,可卖出(200-x)件,当每件商品的定价为______元时,利润最大.

题型:选择题

腓骨上端骨折后足不能背伸、外翻,提示有()。

A.闭孔神经损伤

B.坐骨神经损伤

C.股神经损伤缺损

D.胫神经损伤

E.腓总神经损伤

题型:选择题

甲(14岁)购买了一辆摩托车,在甲的法定代理人实施追认以前,该买卖行为的效力为( )。

A.无效

B.可撤销

C.效力待定

D.有效

题型:选择题

“If you talk to the plants, they will grow faster and the effect is even better if you’re a woman.” Researchers at Royal Horticultural Society carried out an experiment to find that the voice of a woman gardener makes plants grow faster.

The experiment lasted a month and by the end of the study scientists managed to discover that tomato plants grew up two inches taller when women gardeners talked to them instead of male.

Sarah Darwin was the one making the plants the best growth. Her voice was the most “inspiring” for plants than those of nine other gardeners when reading a passage from The Origin of Species. The great-great-granddaughter of the famous botanist (植物学家)Charles Darwin found that her plant grew about two inches taller than the plant of the best male gardener.

Colin Crosbie, Garden Superintendent at RHS, said that the finding cannot yet be explained.He says that women have a greater range of pitch and tone(音高和音色)which might have a certain effect on the sound waves that reach the plant. “Sound waves are an environmental effect just like rain or light ,”said Mr Grosbie.

The study began in April at RHS Garden Wisley in Survey. Scientists started with open auditions(听力) for the people who were asked to record passages from John Wyndham's The Day of the Triffids, Shakespeare’s A Midsummer's Night Dream and Darwin's The Origin of Species.

Afterwards researchers selected a number of different voices and played them to 10 tomato plants during a period of a month. Each plant had headphones connected to it. Through the headphones the sound waves could hit the plants. It was discovered that plants that “listened” to female voices grew taller by an inch in comparison to plants that heard male voices.

小题1:What does the passage talk about?

A.Plants enjoy men’s voices than women’s.

B.A science experiment in a museum.

C.Voice’s influence on plant growing.

D.Strange findings at Royal Horticultural Society.小题2:What does the underlined sentence in paragraph 4 mean?

A.Plants need sound as well as rain and light.

B.Sound is basic for the plant to grow.

C.Sound has a good effect as rain or light does.

D.Plants can’t live without sound, rain or light.小题3:What can we learn from the passage?

A.The experiment ended in May.

B.Scientist can explain the findings clearly.

C.Plants enjoy listening to the passages from famous works.

D.The findings are of great importance to human beings.

题型:选择题

漫画《考古》(改编自《无题》作者:张阿鹤)给我们的哲学启示是()

①办事情要抓重点,牵住牛鼻子

②要积极参与实践,获得真知

③要注重量的积累,持之以恒

④要从整体着眼,把握全局

A.①②

B.②④

C.③④

D.①③

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