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Body Systems The body's circulatory system (血液循环系统) includes the heart and blood vessel...

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Extinction Events 1 The Earth was formed about 4.6 billion years ago. The first life ap...

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A Video Project 1 (M: Manager L: Lisa) M: Congratulations, Lisa! L: Congratulations fo...

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Types of Wars Civil wars are fought between citizens of the same country and are fought...

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Dream Jobs What kind of careers are the best, and what are the qualifications? One of t...

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Alcatraz 1 Alcatraz is a small island (岛，岛屿) in San Francisco Bay (海湾), 1.5 miles from ...

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【Passage 1】 At Alcatraz, he was diagnosed with a disease that began to take over his br...

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Landlord Trouble M: You don't look good. Is something bothering you? W: Yes, it's my la...

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Bussiness and Economics Goods and services supply what people need or want. Goods are t...