题目内容

Thelittleboycameridingfullspeeddownthemotorwayonhisbicycle._____itwas!

A. Whatadangerousscene
B. Whatdangerousascene
C. Howadangerousscene
D. Howdangerousthescene

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It'sthethirdtimethatJohnhasbeenlate,______?

A. hasn'the
B. isn'the
C. isn'tit
D. hasn'tit

“Sheisn't a dancingteacher,isshe?”“______.”

A. Yes,sheisn't
B. No,sheis
C. Yes,shewasn't
D. No, butshewas

如果作物出现烧苗现象，说明其根系细胞液及土壤溶液的渗透压πA、πB的关系为：

A. πA> πB
B. πA< πB
C. πA= πB
D. πA£ πB

测定聚合物的摩尔质量，选择以下方法中哪一种较好？

A. 凝固点下降法
B. 蒸气压下降法
C. 渗透压法
D. 沸点升高法