1. _____ was one of the sites of the September 11, 2001, terrorist attacks.

a. The Brooklyn Bridge
b. Afghanistan
c. The Sears Tower
d. The World Trade Center

2. After the attacks on September 11, 2001, what did the United States ask Afghanistan to do?

a. hand over terrorists to the United States
b. send terrorists to be tried in the World Court
c. hide terrorists until the event could be studied
d. send Afghan experts to question the terrorists’ friends

3. NAFTA is _____ between Canada, Mexico, and the United States.

a. a trade agreement
b. a peace agreement
c. an immigration pact
d. an environmental document

4. What is the greenhouse effect?

a. acid rain affecting the quality of soil
b. when gasses trap the sun's heat near Earth
c. an overall rise in Earth's temperature
d. what happens when fossil fuels mix with acid rain

5. Which of the following is considered an alternative fuel?

a. coal
b. oil
c. ethanol
d. natural gas