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ACT English Practice Test 36

Thời gian làm bài: 1 giờ

Đề thi nằm trong bộ sưu tập: Tuyển Tập Bộ Đề Thi Đại Học Hoa Kỳ (ACT) - Có Đáp Án Chi Tiết


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How Volcanoes Work

What causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, and can Q1 analyze the vibrations of the earth to warn of recent Q2 eruptions.

Most volcanoes were being Q3 the result of magma flowing out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, one of them is Q4 forced under the other, and the seabed rock melts to form new, low-density magma.

This magma is red-hot Q5 and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or adding Q6 more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.

Hotspot volcanoes form Q7 by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. Chains, of volcanic islands called archipelagos, Q8 provide evidence that the hotspot stays in place as the tectonic plate passes over it.

Geologic processes are slow, while Q9 research must include the study of ancient human accounts of eruptions and layers of rock millions of years old. In general, eruptions Q10 seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, that is unlikely to erupt soon. Q11 No one can say for sure that these volcanoes will not erupt again in the future, so scientists take serious Q12 the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people warn Q13 to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions of volcanic eruption, as if Q14 at the Philippines’ Mount Pinatubo in 1991 and Popocatépetl outside Mexico City in 2000.

Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, but Q15 they show that humans have much more to learn about the planet Earth.

Câu 1: 1 điểm

Question 1

A.  

NO CHANGE

B.  

and, can

C.  

and can,

D.  

and

Câu 2: 1 điểm

Question 2

A.  

NO CHANGE

B.  

distant

C.  

approximate

D.  

impending

Câu 3: 1 điểm

Question 3

A.  

NO CHANGE

B.  

Most volcanoes have been

C.  

Most volcanoes are

D.  

Most volcanoes will be

Câu 4: 1 điểm

Question 4

A.  

NO CHANGE

B.  

one of the plates are

C.  

one,

D.  

one plate, being

Câu 5: 1 điểm

Question 5 Given that all of the choices are true, which one provides the most logical cause for the action described in the statement immediately following this underlined portion?

A.  

NO CHANGE

B.  

This magma rises

C.  

This magma condenses

D.  

This magma forms pools

Câu 6: 1 điểm

Question 6

A.  

NO CHANGE

B.  

adds

C.  

add

D.  

added

Câu 7: 1 điểm

Question 7

A.  

NO CHANGE

B.  

Formation of hotspot volcanoes is

C.  

There are hotspot volcanoes that forming

D.  

In addition, hotspot volcanoes are formed

Câu 8: 1 điểm

Question 8

A.  

NO CHANGE

B.  

Chains of volcanic islands, called archipelagos,

C.  

Chains of volcanic islands called archipelagos

D.  

Chains, of volcanic islands, called archipelagos

Câu 9: 1 điểm

Question 9

A.  

NO CHANGE

B.  

slow, but

C.  

slow, so

D.  

slow, although

Câu 10: 1 điểm

Question 10

A.  

NO CHANGE

B.  

Quite regularly, eruptions

C.  

Many times, eruptions

D.  

Often, eruptions

Câu 11: 1 điểm

Question 11

A.  

NO CHANGE

B.  

that is, unlikely to erupt soon

C.  

that is unlikely, to erupt soon

D.  

that, is unlikely to erupt soon

Câu 12: 1 điểm

Question 12

A.  

NO CHANGE

B.  

taken seriously

C.  

seriously taking

D.  

take seriously

Câu 13: 1 điểm

Question 13

A.  

NO CHANGE

B.  

be warning

C.  

receive warning

D.  

have the warning

Câu 14: 1 điểm

Question 14

A.  

NO CHANGE

B.  

most notably

C.  

typically

D.  

characteristically

Câu 15: 1 điểm

Question 15

A.  

NO CHANGE

B.  

seemingly

C.  

when

D.  

and


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