"But they were already both ,pleased and puzzled over the soil test results" in Para. 3 can best be used to mean ______.
A. they felt both happy and satisfactory over the test results
B. they didn't expect to find the wonderful results
C. they wanted very much to do more research over the rocks
D. they were glad to see the results but they can't explain them
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German scientists in charge of the studies ______.
A. thought that the surface soil of Mars is mainly composed of silicon and iron, with a bit of sulfur, chlorine and argon
B. doubted if there is any content of silicon and iron, with a bit more of sulfur, chlorine and argon
C. confirmed that the Martian surface emitted X-rays, which indicated the main composition of the Martian soil
D. indicated that the surface soil of Mars has a main chemical composition of silicon and iron
From the context, it can be concluded that olivine must be ______.
A. a kind of volcanic soil containing lava and mineral rock
B. a kind of volcanic rock with its main content of lava and magnesium
C. a kind of rock mainly consisting of oxygen, iron and magnesium
D. a kind of oxygen with iron and magnesium
Which of the following can be the best title of the passage？
A Brief Introduction to the Research Work of the Science Team
B. The Difference of the Geologists on the Composition of a Rock on Mars
C. What Force Stick Together the fine grains of the Gusev Surface
D. The Spirit Began to Study the Composition of a Rock on Mars
Section B
Directions: In this section, there are 10 incomplete sentences. For each sentence there are 4 choices marked A, B, C and D. Choose the one that best completes the sentence. Then mark the corresponding letter with a single bar across the square brackets on your rnachine-scoring ANSWER SHEET.
Whether a gun is a weapon of offence or a weapon of ______ depends on which end of it you are at.
A. defense
B. attack
C. assault
D. defeat
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