What does the writer want to show in this passage?
A.A discovery by accident sometimes may change the whole world.
B. Saccharin labels are required to carry a cancer warning.
C. People should return to taking table sugar.
D. Saccharin and aspartame are quite safe at normal use levels.
第7题
影响柔韧性的最大因素是_______
A.关节活动范围
B.神经对肌肉的调节
C.年龄和性别
D.身体素质
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