1 . 假设Williams教授写信邀请你给留学生做一个关于中国文化的演讲。请你写信回复，信件内容包括：（1）接受邀请；（2）介绍演讲主题和要点。
注意：1. 词数80左右；2. 可以适当增加细节，以使行文连贯：3. 开头和结尾已给出，不计入总词数。
Dear Professor Williams,

I am honored to give a presentation about Chinese culture to international students at your invitation.

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Sincerely yours,

Li Hua

2 . A huge crowd has gathered to watch China’s new scientific research ship enter the water for the first time. This ship, equipped with on-board labs and the latest scientific kit, will eventually explore the world’s oceans. But it is also going to help China plunge beneath the waves: it will serve as a launch-pad for submarines that can dive to the deepest parts of the ocean. “Humans know much less about the deep oceans than we know about the surface of the Moon and Mars. That’s why I want to develop the facility for ocean scientists to reach the deep seas,” says Prof. Cui Weicheng.

He is the dean of deep sea science at Shanghai Ocean University but he has also set up a private company called Rainbow Fish, which built the new research ship and is busy developing submersibles. One of its unmanned subs reached a depth of 4,000m (13,000ft) in its most recent trial. But Rainbow Fish’s ultimate goal is manned exploration and it plans to take humans to the very bottom of the ocean the Mariana Trench, in the Pacific, at a depth of nearly 11,000m (36,000ft). He shows me around a life-size model of the submarine and explains that there is room inside for a crew of three, who will be protected by a thick metal sphere.”At the moment, we are in the design stage, so we are testing several extremely high-strength materials for it.” It will have to bear immense pressures from the crushing weight of water above. If there are any weaknesses, the submarine will implode. The deepest ocean is a place few people have ever experienced first-hand. The first dive to the Mariana Trench was carried out in 1960 by US Navy Lieutenant Don Walsh and Swiss engineer Jacques Picard. Their vessel, the Bathyscaphe Trieste, creaked and groaned as it made the descent, taking nearly five hours.

The only other manned expedition was carried out by Hollywood director James Cameron, who took a solo plunge in a bright green submarine in 2012. Rainbow Fish wants its sub to be next. The team insists its venture isn’t about politics and that it is looking to collaborate with American, Russian and European scientists. It is, though, a commercial operation. The company plans to charge people to use its research ship and submarines, and is targeting three groups, says managing director Dr. Wu Xin. “The first is definitely the scientists who are interested in studying deep-sea science and technology. The second group is offshore companies and oil companies. The last one is tourists and adventurers [who] want to go down themselves to have a look at what’s going on there,” he says. This kind of entrepreneurial approach may be a new model for science in China. Deep-sea research is a difficult, high-risk activity — and much of the ocean remains unexplored. But Cui, who hopes to be the first Chinese person to reach the Mariana Trench, believes that China could be the nation to truly open up this final frontier.

1. What function does the new scientific research ship serve?

A．As a deep-sea facility for tourist adventures

B．As a supply ship for scientific explorations.

C．As a station for observing giant squid.

D．As a launch-pad for submarines.

2. What is Prof. Cui Weicheng currently doing?

A．Testing high-strength materials for building submarines.

B．Designing a thick metal sphere for bearing space pressure.

C．Charting the Mariana Trench in the western Pacific Ocean.

D．Making plans for his dive to the bottom of the Mariana Trench.

3. What does “this kind of entrepreneurial approach” in the last paragraph mean?

A．Prof. Cui doesn’t rely on government funding. Instead he runs a for-profit business.

B．Prof. Cui is bold in his submarine design.

C．Prof. Cui, who started the company, is a professor-turned entrepreneur.

D．Prof. Cui is the first to offer his ship for tourists.

4. Which of the following might be the best title of this passage?

A．Deep-sea science and technology	B．Ocean exploration
C．Race to the deep	D．The rising of Rainbow Fish