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第1题

(2分) 当x→0时,2sinx是（）无穷小量 A. 低阶 B. 高阶 C. 等价 D. 同阶但不等价．
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第2题

(2分)It is ______ to examine these questions carefully by doing more group discussions. A. worthy B. worth C. worth
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第3题

(2分)Eating and drinking too much is harmful （ ）health. A. on B. at C. about D. to
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第4题

(2分)“You can’t have this football back ______ you promise not to kick it at my cat again.” the old man said firmly. A.
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