Diamonds have (A) the unique ability (B) to allow the passage of neither (C) infrared and (D) visible light.

Gilbert Newton Lewis, a (A) chemist, helped to develop (B) the modern electron theory of valence, a theory what (C) explains the forces holding atoms together (D) in molecules.

The first women (A) governor in United States history was (B) Nellie Tayloe Ross, who (C) was elected governor of (D) Wyoming in 1925.

Because of a high (A) birthrate and considerable (B) immigration, the United States population in the late nineteenth century increased (C) tremendously into (D) 31 million in 1860 to 76 million in 1900.

In laboratory experiments, an investigator often (A) begins by work (B) out different conditions for (C) two groups of subjects (D).

In Florida, when (A) the temperature drops (B) below freezing, citrus growers keep young tree (C) warm by constantly showering them with water (D).

The pitch of a musical (A) instrument is defined as (B) the relative highness or low (C) of the sound it produces (D)

The delicious (A) of chocolate depends not only on the quality (B) of the cacao but also (C) on a complex process of (D) grinding, heating, and blending.

Scientists have found that occasional exposure (A) to bright light can be help (B) a person get used to working (C) the night shift (D).

Rocks have forming, wearing away and reforming ever since the Earth took shape.

For most of their (A) history, especially (B) since the (C) 1860's, New York City has been undergoing major ethnic population changes (D).

The dramatic (A) first-floor gallery of the (B) New Britain Museum of American Art is devoted (C) to Thomas Benton's series of five oversized mural (D).

Although (A) color is a minor (B) factor in soil composition, it is excellent (C) characteristic by which to distinguish different (D) soil layers.

Eagles are predatory birds that have (A) large, heavy, hooked (B) bills and strong, sharp (C) claws called as (D) "talons."

Cotton (A) is one of the most popular (B) fiber (C) used to make (D) clothes.

Turreted mansions decorated (A) with elaborate (B) wooden ornamentation became (C) a mark of wealthy (D) and elegance in the United States in the late nineteen century.

Most of our ideas of what (A) ancient people looked and (B) dressed come from (C) the works of (D) Renaissance artists.

Plants require much less moist in cold weather than in warm weather.

All nations may have to make (A) fundamental changes in (B) their economic, political, and the technological institutions (C) if they are to preserve (D) the environment.