A.To inform us that mobile phones are useful. |
B.To introduce the topic for discussion. |
C.To warn us that we should be careful. |
D.To tell us we should get phones ready for a trip. |
A.Fear of losing mobile phones. |
B.Habits of using mobile phones |
C.Eagerness for new mobile phones. |
D.Independence of mobile phones. |
A.Avoiding using phone for some time |
B.Learning more about modern technology. |
C.Protecting one’s phone against any damage. |
D.Not using a mobile phone in one’s daily work. |
A.It lets you know other people also lose their phones. |
B.It will give you a new phone through insurance. |
C.It enables you to reconnect with your acquaintance. |
D.It gives you a prescription to treat nomophobia. |
A.Solutions to nomophobia. | B.New mobile phone technology. |
C.Disadvantages of mobile phone. | D.Attitude toward mobile phone. |
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D.it is seen from the space telescopes |
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B.The gravity of a black hole holds all light in its center. |
C.Scientists observe high-energy light through their own eyes. |
D.Some small black holes came into being as early as the universe. |
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C.a(chǎn) series of stars | D.a(chǎn) planet near the earth |
A.Neither the sun nor the earth is as heavy as a black hole. |
B.There is a supermassive black hole at the center of the Milky Way. |
C.The supermassive black hole had existed before the Milky Way was formed. |
D.There is a reason why the large black holes are called “supermassive”. |
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C.Because of the failure of having a significant temperature difference. |
D.Because it was hard to focus the sun’s rays with equipment of mirrors. |
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B.more common than partial or full lunar eclipse |
C.the result of the shadow cast by the Moon onto the Earth |
D.more difficult to observe than other types of lunar eclipse |
A.moonlight is less strong than sunlight |
B.a(chǎn) lunar eclipse is briefer than a solar eclipse |
C.a(chǎn) lunar eclipse lasts much longer than a solar eclipse |
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