单项选择题

If the value of XYZ Company stock drops from $25 per share to $21 per share, what is the percent of decrease?

A.20
B.16
C.12
D.8
E.4

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单项选择题

Suppose that chemical composition is uniform among stars formed from the same cloud of gas and dust, but that chemical composition varies among stars formed from different clouds of gas and dust. Student 2 would most likely agree with which of the following statements comparing the chemical compositions of the stars in the present-day Algol system at the time they formed?

A.Algol
B.
B.Algol
C.
C.Algol
D.
D.Algol
E.

单项选择题

Based on Table 1, a cosmic ray flux of 440,000 particles/m2/hr would correspond to a cover of low clouds that is closest to which of the following?

A.28.7%
B.29.0%
C.29.3%
D.29.6%