Review TOEFL Structure Skills 20-60

The wave lengths of ultraviolet light are short than those of visible light but longer than those of X-rays.

• length

• short

• those

• but

All thoroughbreds are descended from three Arabian stallion imported into England between 1689 and 1724.

• All

• from

• stallion

• into

By measuring the rate of decay of potassium isotopes in volcanic ash, scientists can date the layers of volcanic ash and any human remains in they.

• measuring

• can date

• remains

• they

Hundreds of partial to complete fossil skeletons of Triceratops have been gather in North America from rocks of the late Cretaceous period.

• Hundreds

• to complete

• gather

• rocks

By the time of the dinosaurs, turtles have already developed the hard shell into which their heads and legs could be drawn.

• time

• have

• into which

• drawn

A zoom lens produces an inverted real image, either on the film in a camera and on the light-sensitive tube of a television camera.

• A

• produces

• inverted

• and

Thirty-one pairs of spinal nerves are present in humans, and each pair have two roots.

• pairs

• are

• present

• have

William Randolph Hearst built a chain of newspapers that included 25 dailies and 11 Sunday editions at their peak in 1937.

• built

• that

• dailies

• their

The electromagnetic spectrum consists in bands of different wavelengths.

• spectrum

• in

• bands

• wavelengths

Some of the most useful resistor material are carbon, metals, and metallic alloys.

• Some of

• most useful resistor

• material

• metallic