单项选择题

Mary has got a full mark in the test. She （） very hard all these days.

A、 will work
B、may work
C、could have worked
D、must have worked

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单项选择题
What does the woman mean（）

A．The old man can’t learn even if he wants to.
B．Drawing is easier for old people.
C．The man can still learn drawing.
D．Learn while you are young.
单项选择题
From the first paragraph we know that parts of numbers smaller than 1 are given （） in scientific usage.

A、 as fractions
B、 as digits
C、 as combinations of digits
D、 as decimals
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