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【单选题】
甲氨蝶呤影响核酸合成的机制是（ ）。A.
抑制核苷酸还原酶
B.
抑制DNA多聚酶
C.
抑制二氢叶酸还原酶
D.
阻止嘌呤核苷酸形成
E.
抑制脱氧胸苷酸合成酶
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【简答题】The movement of ocean water serves to regulate the climate on land．
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A.
25
B.
30
C.
48
D.
24
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【单选题】What did the man assume previously?
A.
She would go to the bookstore.
B.
She would not go to the bookstore.
C.
She would go to the bookstore later.
D.
She would go to another bookstore.
【单选题】Nearly six million people go to see the Mona Lisa every year, attracted by the o f her smile. When you're not looking at her, she seems to be smiling when you look a t her , she stops.
A.
outline
B.
shape
C.
mystery
D.
pleasure
【简答题】不超过20℃（ ）。
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