We all know Mars. It is the fourth planet from the sun. It was named _(1)_ the Roman god of war and got its nickname from its red iron oxide filled soil. How much do we really know about Mars? For years, people _(2)_ about Martians and strange civilizations living on the Red Planet. When NASA finally got aspacecraft to fly by Mars in 1965, something much different but just as awe-inspiring was discovered. There are many _(3)_ between Earth and Mars. They both have polar ice caps and similar seasonal transitions. There are volcanoes, valleys, mountains, and deserts on Mars like we have here. Its soil even has many of the _(4)_nutrients needed for growing plants. Because of all this, scientists cannot help but _(5)_ if one day we will be able to build colonies on Mars. Our _(6)_ about Mars is so strong that we are currently getting data from five different sources on or around the planet. Three orbiters monitor changes in the seasons and time. Two rovers take samples and give ground-level views of the planet's terrain. One question scientists hope to answer is about the streaks in the Martian soil. New ones often appear on the sides of mountains and valleys. They are very dark in color in the beginning, but become lighter _(7)_. Are they caused by dust storms or avalanches? Could they be growing organisms? At the moment, scientists don't have an answer. This is just one of the many mysteriesthey hope to solve as they keep exploring the Red Planet.
1. (A) into (B) after (C) as (D) with 2. (A) speculated (B) competed (C) proceeded (D) suffered 3. (A) decorations (B) impressions (C) similarities (D) capabilities 4. (A) abstract (B) flexible (C) respectful (D) essential 5. (A) wonder (B) to wonder (C) wondering (D) wondered 6. (A) permission (B) tolerance (C) approval (D) curiosity 7. (A) by accident (B) over time (C) in advance (D) at random
|
留言列表