On a trip^(A) down to the bottom^(B) of the Grand Canyon^(C), the equipment will in all probability be carried by a^(D) burros.

• A

• B

• C

• D

Ford designed the first^(A) large-scale assembly line^(B) at plant^(C) in Highland Park, Michigan^(D).

• A

• B

• C

• D

In the^(A) human body, blood flows from a^(B) heart through the arteries^(C) and it returns through the^(D) veins.

• A

• B

• C

• D

The scholarship^(A) that Wilson received to study history^(B) at Cambridge^(C) presented an^(D) unique opportunity.

• A

• B

• C

• D

Observations from Earth indicate that at the^(A) solar surface, the outward^(B) magnetic field is a^(C) strongest at the polar regions^(D).

• A

• B

• C

• D

A radar^(A) images of Venus add details^(B) about a planet^(C) dominated by volcanoes and lava^(D).

• A

• B

• C

• D

In 1863 and 1864, the U.S. Congress passed the National Bank Acts^(A), which set up a^(B) system of privately owned banks^(C) chartered by a federal government^(D).

• A

• B

• C

• D

An^(A) human ear^(B) responds to a wide range^(C) of frequencies^(D)

• A

• B

• C

• D

Bacteria that live in soil and water^(A) play a vital role^(B) in recycling carbon, nitrogen, sulfur, and another^(C) chemical elements used by living things^(D)

• A

• B

• C

• D

During the U.S.^(A) Civil War, an American^(B) balloonist organized a balloon^(C) corps in Army^(D).

• A

• B

• C

• D