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【单选题】
唾液淀粉酶的激活剂是A.
镁离子
B.
氯离子
C.
钠离子
D.
铜离子
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反馈参考答案：
举一反三
【简答题】adj. unhappy or not satisfied with the situation you are in
【简答题】waist
【单选题】Which statement is TRUE?
A.
The average waist size for a man is 36-38 in.
B.
The average waist size for a woman is 30 in.
C.
In the mid-Eighties, more than half million under-16s in the UK are classed as overweight.
D.
The obesity pandemic has now spread to South America.
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