It’s too bad that I failed in the math exam. If only I hard at it! A．worked B．had worked C．has worked D．would work 题目和参考答案——青夏教育精英家教网—

题目内容

It’s too bad that I failed in the math exam. If only I ______ hard at it!

A．worked

B．had worked

C．has worked

D．would work

【答案】

【解析】

试题分析：考查虚拟语气：if only表示“但愿…就好了”，后面的从句用虚拟语气，谓语用相应的过去时，和现在相反用过去时，和过去相反用过去完成时，和将来相反用过去将来时。这句话是指和过去相反，用过去完成时。句意是：我数学考试没及格，真是太糟糕了。选B

考点：考查虚拟语气

点评：If only和I wish后面的从句都用虚拟语气，形式也一样，学生可以一起记忆，关键是动词的形式，就是用相应的过去时。

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The study, which was administered by PBS under a grant from the Department of Education, first tested the vocabulary level of a group of 90 Title 1 school children, aged 3 to 7. Then, the children were each given two weeks with an iPod Touch loaded with the Martha Speaks Dog Party app created by PBS Kids.

The study monitored how the children used the iPod, during what hours, and in what context. On average, the study found that kids played with the iPod Touch for a total of 5 hours across the two weeks, with half that time spent playing the Martha Speaks app. At the end of the two week trial, the children were given another vocabulary test, which revealed an increase in vocabulary acquisition by as much as 31 per cent.

The study findings are particularly useful as smart phones and mobile devices have become increasingly popular among families and parents are faced with a proliferation of mobile apps designed for kids. According to a recent Nielsen study, smart phone usage is 12% higher in households with children than other households.

“Mobile apps can be a great learning tool in the hands of children,” said Lesli Rotenberg, SVP, Children’s Media, PBS. “This research is important in helping to better understand and guide the development of new apps that improve the value of children’s screen time with significant educational outcomes.”

So what does it all mean? Well, at the very least it will help parents get over that guilty feeling when they hand over their iPhone or iPod Touch for a little peace and quiet. At best, it provides more evidence that mobile devices and apps do indeed have educational value and could be an important part of the child-learning process for many years to come.

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A. he has a positive attitude towards mobile apps

B. he thinks children should never use smart phones

C. he is doubtful about mobile apps designed for children

D. he thinks parents should be careful with mobile apps for children

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A. parents will feel more comfortable giving kids iPhone or iPod Touch

B. parents will know what kind of mobile phones are suitable for kids

C. parents will know what children do with mobile phones

D. parents can watch over their children now and then

3.What would be the best title of the text?

A. The popularity of smart phones among kids

B. The entertaining function of smart phones

C. Smart phones make kids learn more.

D. It’s too early for kids to use smart phones

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The planet itself, based on scientific models of how planets form, is believed to have started taking shape about 50,000 to 100,000 years ago.

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Kraus and his colleague, Michael Ireland from Macquarie University and the Australian Astronomical Observatory, used Keck telescopes on Mauna Kea(a volcano on the island of Hawaii, US) to find the planet. Kraus presented the discovery Wednesday at NASA’s Goddard Space Flight Center in Maryland.

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A. have been working in the same university

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C. used two new methods in the observation

D. cut holes in the mirrors when observing

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A. Youngest planet seen as it’s forming.

B. Planet 450 light years away discovered.

C. World’s first direct image of a planet taken.

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