填空题

It ______ (直到去年) my sister，a chronic sleepwalker，found a doctor who could tell her what her problem was and how to treat it．

【参考答案】

wasn’t until last year that
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填空题
Czerwinski found that no other change to a computer system could more significantly improve a user’s productivity than ________ .
单项选择题
According to the passage, which of the following statements is TRUE
A．The woody stems contain more wafer than the leaves.
B．Only part of the carbon dioxide in the plants is synthesized.
C．The mineral elements will not be absorbed by the plant unless dissolved in their roots.
D．Air existing around the leaf is found to be saturated.
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