[题目]The teacher speaks loudly so that the students can hear her .A. slowly B. clearly C. quietly D. carefully 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】The teacher speaks loudly so that(以便) the students can hear her ____.

A. slowly B. clearly C. quietly D. carefully

【答案】B

【解析】句意：老师说话声音很大以便于学生们能够清楚地听到她。slowly慢慢地；clearly清楚地；quietly安静地；carefully仔细地。根据句意The teacher speaks loudly…可知，老师说话声音大，是为了让学生们听清楚，故应选B。

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【题目】

Alfred Wegener was a scientist in the early 1900s. He had a strange theory. His theory is that 250 million years ago there was one giant continent (洲). He called the giant continents as Pangaea. He thought Pangaea changed millions of years later. It started breaking up. The continent slowly drifted apart. They became continents we know today.

Wegener made many studies. He looked at world maps and thought that some continents were like puzzle pieces. They could fit together. He went to South America as well as Africa. He looked at mountains on both continents. They would match if the continents were pushed together. Wegener found similar fossils (化石), plants and animals on both continents.

Alfred Wegener called his theory “continental drift”. In 1912, he told other scientists about his theory. Most thought Wegener was crazy. They didn't believe huge pieces of land could move.

Later, other scientists did more studies. They discovered that continents are actually moving all the time. Scientists know that the surface of Earth is not one piece. They think it's broken into large pieces of hard rock called tectonic plates (地壳板块). Scientists believe there are 30 tectonic plates on Earth and the continents lie on top of them.

Under Earth's surface is the mantle ( 地幔). The mantle is a layer ( 层) of rock about 2,900 km thick. The temperature rises to 3, 700C at the bottom of the mantle. The heat causes the mantle to become hot, molten (熔化的) rock which flows around.

The tectonic plates float like rafts on top of the hot, molten rock but they move very slowly-only about 4 inches (10 cm) each year. Since continents lie on top of the tectonic plates, they also float or move.

Today, scientists know the continents are still moving. Alfred Wegener's theory was proved correct.

【1】What does a theory in the first paragraph mean in this article?

A.An idea based on studies.B.An opinion based on a feeling.

C.A correct answer to a question.D.A wrong answer to a question.

【2】What was the name of Alfred Wegener's theory?

A.Pangaea.B.Continental drift.C.Tectonic plates.D.Continental plates.

【3】Where did Alfred Wegener find clues to prove his theory?

A.Only in Africa.B.All over the world.

C.Only in South America.D.In both Africa and South America.

【4】What did scientists in the early 1900s think about Wegener's theory?

A.They agreed with him.B.They thought it was crazy.

C.They copied his idea right away.D.They gave him praise for it.

【5】Why do scientists think continents can move?

A.The heat of the tectonic plates causes continents to move.

B.The movement of ocean water causes the continents to move.

C.Continents are huge pieces of land that can be pushed together.

D.Continents lie on top of tectonic plates that float on hot, molten rock.

【题目】They eat many but little _.

A. vegetables; meat

B. vegetables; meats

C. vegetable; meats

【题目】

The opening ceremony开幕式) of the Tokyo Summer Olympics will be on July 24, 2020. One year before the event, its medal designs(奖牌设计) were shown, CBS News reported.

However, the medals are quite different from the ones seen in other Olympics. People used old cell phones and other electronic waste to make them!

The organizing committee chose the medal designs by holding a competition. Competitors brought 400 designs. The winner was 51-year-old designer Junichi Kawanishi, the Guardian wrote.

The medals look like pebbles(鹅卵石) and are 8.5 cm in diameter(直径). The front face has a picture of Nike, the Greek goddess of victory.

The committee will make 5,000 medals for this summer's games. Japan is the first Olympic host country to make all of its medals from electronic waste.

【1】The Olympics will be held in Japan this summer.

【2】The medals are different mostly because it has a picture of Nike in the front face.

【3】Junichi Kawanishi beat the other competitors in the competition.

【4】From the passage, we are sure it's the first time for an Olympic host country to make medals from waste.

【5】From the passage, we can infer(推断) that Japanese value environmental protection.