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4. The rescue workers from the central and local governments (try) to save the passengers on board since the ship sank.

4. have been trying

題目來源：全品作業本高中英語選修8新課標人教版 > Period Two Grammar

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A Researchers have discovered stone tools in Norfolk,UK, which suggest that early humans arrived in Britain nearly a million years ago―or even earlier. The find pushes back the arrival of the first hu?mans in what is now the UK by several hundred thousand years.

Environmental data suggests that temperatures were relatively cool. This raises the possibility that these early Britons may have been among the first humans to use fire to keep warm. They may also have been some of the earliest humans to wear fur clothing. With the ancient tools were plant material,including a pine cone that pro?vided clues about climate.

The discoveries were made in Happisburgh,in the north of Norfolk. At the time there was a land bridge connecting what is now southern Britain with continen?tal Europe.

There are no early human remains,but the researchers speculate (推測) that the most likely species was Homo antecessor,more commonly―and possibly appro?priately―known as "Pioneer Man".

Remains of the species have been found in the Atapuerca region of northern Spain,and date back to0. 8〜1,2 million years ago. So the species could well have been in Britain at around that time,according to Professor Chris Stringer of the Natural History Museum in London. "If the climate was good and the land bridge was there,there's no real reason why they couldn't have come (to Britain) as far back as1. 2 million years ago," he told BBC News.

One million years ago,a land bridge linked the UK to continental Europe. Pio?neer man was much like our own species in that it walked upright,used tools and was a huntergatherer. But physically the species looked rather different. It had a smaller brain,strong brow ridges and big teeth,with some primitive features such as a flat face and no prominent chin (凸起的下巴) on the lower jaw.

1. What's the evidence of these early Britons being among the first humans to wear fur clothing?

A. The use of fire to keep warm.

B. The stone tools they used.

C. The land bridge they used.

D. The relatively cool temperatures.

2. What Professor Chris Stringer said in Paragraph 5 implies that .

A. he thought they came to Britain about1. 2 million years ago

B. they built the land bridge in order to have access to Britain

C. the climate was not good enough at that period of time

D. he didn't know the reason why they came here

3. What is the passage mainly about?

A. The process of human development.