题目内容
14. When a boat is going , its speed becomes much higher.
A. forward B. downward
C. upstream D. downstream
14. D
14. D解析:句意:当船顺流而下时,它的速 度变得快得多。
downstream意为“顺流而 下”,符合句意。
forward意为“向前”; downward意为“向下”;upstream意为“逆 流而上”。
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